HYPOXANTHINE MOLECULES

PRODUCT

CAS RN

1-((2-Methyl-5-methylene-5-oxotetrahydrofuran-2-yl)methyl)guanine 105970-04-5
1-(Cyclohexylmethyl)piperidine 1,2,3,6-tetrahydro-1,3-dimethyl-2,6-dioxopurine-7-acetate 15031-52-4
1-(Guan-1-yl)-2-(cystein-S-yl)ethane 106947-24-4
1,3,7-Trimethylguanine 110025-83-7
1,4-Dihydro-9H-imidazo(1,2-a)purin-9-one 56287-13-9
1,7-Dihydro-1,7-dimethyl-6H-purin-6-one 33155-83-8
1,7-Dihydro-2-((4-butylphenyl)amino)-6-purin-6-one 83173-14-2
1,9-Dihydro-2-((3-ethyl-4-methylphenyl)amino)-6H-purin-6-one 104715-65-3
1,9-Dihydro-2-((4-butylphenyl)amino)-9-((2-hydroxyethoxy)methyl)-6H-purine-6-one 104715-80-2
1,9-Dimethyl-2-(methylthio)hypoxanthine 10154-09-3
1,9-Dimethylguanine 42484-34-4
1,9-Dimethylhypoxanthine 20535-82-4
1-Deaza-6-thioguanine 60282-76-0
1-Hydroxyguanine 42046-96-8
1-Hydroxyisoguanine 7593-46-6
1-Methylguanine 938-85-2
1-Methylguanine-3-oxide 30345-23-4
1-Methylhypoxanthine 1125-39-9
1-Methylthioguanine 16714-57-1
2-(2-(2-Amino-9H-purin-9-yl)ethyl)-1,3-propanediol 104227-86-3
2-(p-n-Butylphenyl)-6-thioguanine 104715-68-6
2',3'-Dideoxy-3'-hydroxymethyl guanosine 133713-61-8
2,4-Diaminohypoxanthine 56-06-4
2,5-Diaminothiazolo(5,4-d)pyrimidin-7(6H)-one 103322-70-9
2,6-Diamino-4-hydroxy-5-formamidopyrimidine 133310-38-0
2,6-Diamino-9-(2-hydroxyethoxymethyl)purine 59277-86-0
2,8-Dihydroxypurine 13230-99-4
2,8-Dithio-6-oxypurine 15986-32-0
2-Amino-2-deoxy-beta-arabinofuranosylguanine 69427-81-2
2-Amino-6-chloropurine 10310-21-1
2-Amino-9-(2,3-bis(hydroxymethyl)cyclobutyl)-1,9-dihydro-6H-purin-6-one 126062-18-8
2-Amino-9-(4-hydroxy-5-hydroxymethyl-tetrahydro-furan-2-yl)-1,9-dihydro-purin-6-one 116002-28-9
2-Amino-N6-hydroxyadenine 7269-57-0
2-Amino-N6-methoxyadenine 60254-48-0
2-Azahypoxanthine 4656-86-4
2-Azahypoxanthine 63907-29-9
2-Chlorohypoxanthine 13368-14-4
2'-Deoxy-2'-methyleneguanosine 141320-64-1
2-Deoxy-7-alpha-D-erythro-pentofuranosyl-3-deazaguanine 83587-64-8
2-Deoxy-7-beta-D-ribofuranosyl-3-deazaguanine 58459-36-2
2'-Desoxy-6-thioguanosine 789-61-7
2-Hydroxypurine 2308-57-8
2-Mercaptoadenine 3647-48-1
2-Methylamino-6-oxopurine 10030-78-1
2'-O-Glycyl acyclovir 84499-62-7
2-Phosphonylmethoxyethyl-6-oxopurine 113884-65-4
2-Thioxanthene 2487-40-3
3-(2-Amino-4-oxo-3H,5H-pyrrolo(3,2-d)pyrimidin-7-yl)-3-(3-chlorophenyl)propanoic acid 139367-68-3
3,7-Dideazaguanine 75938-36-2
3,9-Dpmoip 134287-58-4
3-Acetylpyridine adenine dinucleotide 86-08-8
3-Deaza-2'-deoxyguanosine 83587-63-7
3-Deazaguanine 41729-52-6
3-Deazaguanosine 56039-11-3
3'-Deoxyguanine-5'-triphosphate 55968-37-1
3-Hydroxy-1-methylguanine acetate 52212-83-6
3-Hydroxy-1-methylguanine 63885-07-4
3-Hydroxy-2-oxopurine 54643-52-6
3-Hydroxy-7-methylguanine 30345-27-8
3-Hydroxy-9-methylguanine 30345-28-9
3-Isoinosine 6835-54-7
3-Methylguanine 2958-98-7
4,5-Diaminohypoxanthine 1672-50-0
4,9-Dihydro-4,6-dimethyl-9-oxo-1H-imidazo(1,2-a)purine 33359-03-4
4-Butylphenylguanine 21318-90-1
5'-Guanylic acid, homopolymer 25191-14-4
6,8-Dihydroxypurine 13231-00-0
6-Ethylguanine 51866-19-4
6-Hydroxy-8-mercaptopurine 6305-94-8
6-Hydroxyethylguanine 78014-96-7
6-Imino-1,9-dimethyl-8-oxopurine 98601-03-7
6-Mercaptopurine 50-44-2
6-Methoxypurine 1074-89-1
6-Methylthioguanine 1198-47-6
6-O-Benzylguanine 19916-73-5
6-Selenoguanine 5375-85-9
6-Thio-3-deazaguanine 52605-85-3
6-Thio-7-methylguanine 7329-79-5
6-Thioguainine disulfide 90920-73-3
6-Thioguanine-alpha-2,3-dideoxy-3-(hydroxymethyl)-D-erythro-pentafuranose 69828-00-8
6-Thioguanosine 85-31-4
6-Thioguanylic acid 15867-02-4
7-(2-Aminoethyl)guanine 76495-81-3
7-(2-Carboxyethyl)guanine 1082-07-1
7-(2-Cyanoethyl)guanine 100234-52-4
7-(2'-Fluoroethyl)guanine 125973-91-3
7-(2-Hydroxyethyl)guanine (Ring-opened) 131478-95-0
7-(4-Oxobutyl)guanine 123752-07-8
7-(6'-Deoxy-beta-D-allofuranosyl)guanine 85421-88-1
7-(6-Deoxy-beta-D-allofuranosyl)hypoxanthine 85421-85-8
7-(6'-Deoxytalofuranosyl)hypoxanthine 86527-19-7
7-(7,8,9-Trihydroxy-7,8,9,10-tetrahydrobenzo(a)-pyren-10-yl)guanine 66421-14-5
7-(beta-Chloroethyl)guanine 22247-87-6
7,7'-(Thiodiethylene)diguanine 5966-32-5
7,8-Dihydrothiazole(3,2e)hypoxanthine 86870-52-2
7,9-Bis(2-carboxyethyl)guanine 93490-22-3
7,9-Dimethylguanine 55235-22-8
7-beta-Ribofuranosylguanine 15373-27-0
7-beta-Ribofuranosylhypoxanthine 10280-01-0
7-Carboxymethylguanine 73891-84-6
7-Deazaguanine 7355-55-7
7-Ethylguanine 19530-88-2
7H-Pyrrolo(2,3-d)pyrimidin-4-ol 3680-71-5
7-Hydroxyguanine 16870-91-0
7-Isopropylguanine 55146-06-0
7-Methyl-2-methylthiohypoxanthine 39013-80-4
7-Methyl-2-thiohypoxanthine 5730-09-6
7-Methylguanine 578-76-7
7-Methylhypoxanthine 1006-08-2
7-Methylwye 96881-39-9
7-N-(2-Oxoethyl)guanine 73100-87-5
7-n-Propylguanine 33016-34-1
8-(2,3,4-Trihydroxybutyl)guanine 120083-56-9
8-(Phenylazo)guanine 79953-00-7
8-(p-Nitrophenyl)guanine 14173-37-6
8-Amino-3-benzylhypoxanthine 139460-96-1
8-Amino-3-deazaguanine 103438-45-5
8-Amino-9-(2-thienylmethyl)guanine 104162-90-5
8-Amino-9-benzylguanine 100890-94-6
8-Aminoguanine 28128-41-8
8-Aminoxanthine 5461-03-0
8-Azaguanine 134-58-7
8-Azahypoxanthine 2683-90-1
8-Bromo-9-(2,3-bis(hydroxymethyl)cyclobutyl)guanine 130464-67-4
8-Bromoguanine 3066-84-0
8-Chloroguanine 22052-03-5
8-Diethylaminoethyl-3,7-dimethyl-2-dimethylaminohypoxanthine 27979-68-6
8-Diethylaminomethyl-2,3,7-trimethylhypoxanthine 27979-66-4
8-Diethylaminomethyl-3,7-dimethyl-2-ethoxyhypoxanthine 27979-67-5
8-Hydroxyacyclovir 80685-23-0
8-Hydroxyguanine 5614-64-2
8-Methylguanine 23662-75-1
8-Methylguanine 7-oxide 143101-66-0
8-Methyltheophylline 830-65-9
8-Oxo-7,8-dihydrodeoxyguanine 6957-76-2
8-Oxo-7-hydrodeoxyguanosine 88847-89-6
8-Oxyguanine 82014-86-6
9-(((Ethoxyhydroxyphosphinyl)methoxy)methoxy)guanine 159430-16-7
9-((1,3-Dihydroxy-2-propylsulfinyl)methyl)guanine 97151-31-0
9-((1,3-Dihydroxy-2-propylthio)methyl)guanine 97151-23-0
9-((1beta,2alpha,3beta)-2,3-Bis(hydroxymethyl)-1-cyclobutyl)hypoxanthine 126452-01-5
9-((2-(Hydroxymethyl)cyclohexyl)methyl)guanine 129982-32-7
9-((2,3-Dihydroxy-1-propoxy)methyl)guanine 96429-66-2
9-((2-Aminoethoxy)methyl)guanine 79353-04-1
9-((2-Benzyloxyl-1-(benzyloxymethyl)ethoxy)methyl)-6-chloroguanine 84222-47-9
9-((2-Hydroxy-1,3,2-dioxaphosphorinan-5-
yl)oxymethyl)guanine P-oxide
86357-22-4
9((2-Hydroxy-1,3,2-dioxaphosphorinan-5-yl)oxy-methyl)guanine-P-oxide 91516-85-7
9-((2-Hydroxyethoxy)methyl)-8-aminoguanine 91898-00-9
9-((2-Hydroxyethoxy)methyl)-8-bromoguanine 81475-44-7
9-((2-Hydroxyethoxy)methyl)-8-chloroguanine 91897-98-2
9-((2-Hydroxyethoxy)methyl)-8-dimethylaminoguanine 91898-02-1
9-((2-Hydroxyethoxy)methyl)-8-iodoguanine 91897-99-3
9-((2-Hydroxyethoxy)methyl)-8-N-piperidinylguanine 91898-03-2
9-((2-Hydroxyethoxy)methyl)hypoxanthine 91897-95-9
9-((2-Methyl-4-methylene-5-oxotetrahydrofuran-2-yl)methyl)hypoxanthine 100682-44-8
9-((2-Phosphonylmethoxy)ethyl)guanine 114088-58-3
9-((2S)-3-Hydroxy-2-phosphonylmethoxypropyl)-6-oxopurine 114088-57-2
9-(1,2-Dihydroxy-2-propoxymethyl)guanine triphosphate 86761-38-8
9-(1,3-Dihydroxy-2-propoxymethyl)-Guanine monophosphate 93824-31-8
9-(1,3-Dihydroxy-2-propoxymethyl)-guanine-bis(monophosphate) 91516-84-6
9-(1'-Hydroxy-2'-(hydroxymethyl)ethoxy)methylguanine 145621-08-5
9-(1-Hydroxy-4-phosphinyl-2-butoxymethyl)guanine 104880-60-6
9-(2-(Hydroxymethyl)-1,3-oxathiolan-5-yl)hypoxanthine 149819-61-4
9-(2,3-Dideoxy-2-fluoro-alpha-D-glycero-pent-2-eno-furanosyl)guanine 405238-82-6
9-(2,3-Dideoxy-2-fluoro-alpha-D-glycero-pent-2-eno-furanosyl)hypoxanthine 405238-80-4
9-(2,3-Dideoxy-2-fluoro-beta-D-glycero-pent-2-eno-furanosyl)guanine 405238-81-5
9-(2,3-Dideoxy-2-fluoro-beta-D-glycero-pent-2-eno-furanosyl)hypoxanthine 405238-79-1
9-(2,3-Dideoxy-2-fluoro-betad-threo-pentofuranosyl)hypoxanthine 117525-25-4
9-(2,4-Dihydroxybutyl)guanine 83470-65-9
9-(2-Carboxyethyl)guanine 84628-22-8
9-(2-Deoxy-2-fluoroarabinofuranosyl)guanine 103884-98-6
9-(2-Deoxy-4-C-ethynyl-beta-D-ribo-pentofuranosyl)guanine 306305-14-6
9-(2-Methylidene-3-(phosphonomethoxy)propyl)guanine 176434-89-2
9-(2-Methylidene-3-(phosphonomethoxy)propyl)guanine 176434-89-2
9-(3-(Aden-9-yl)propyl)-2-dimethylaminopurin-6-one 28077-96-5
9-(3-(Cytos-1-yl)propyl)-2-dimethylaminopurin-6-one 28098-44-4
9-(3-(Phosphonomethoxy)propyl)guanine 117086-99-4
9-(3,3-bis(Hydroxymethyl)cyclobutyl)guanine 130368-81-9
9-(3,3-Dimethyl-5-phosphonopentyl)guanine 155270-69-2
9-(3,4-Dihydroxybutyl)guanine 83470-64-8
9-(3,4-Dioxopentyl)hypoxanthine 84182-19-4
9-(3,5-Dihydroxypent-1-yl)guanine 128631-61-8
9-(3,5-Dihydroxypentyl)-7-deazaguanine 128631-57-2
9-(3'-Azido-3'-deoxy-beta-xylofuranosyl)guanine 5'-triphosphate 92117-26-5
9-(3'-Ethylphosphono-1'-hydroxymethyl-1'-propyloxymethyl)guanine 150943-49-0
9-(3-Hydroxy-2-phosphonomethoxypropyl)guanine 113852-36-1
9-(3-Hydroxypropoxy)guanine 114778-60-8
9-(4-Hydroxy-2-(hydroxymethyl)butyl)-guanine triphosphate 117191-32-9
9-(4-Hydroxy-2-(hydroxymethyl)butyl)guanine 105868-85-7
9-(4-Hydroxy-2-buten)guanine 99776-29-1
9-(4-Hydroxy-2-buten-1-yl)guanine 104715-61-9
9-(4-Hydroxy-2-butyn)guanine 99776-30-4
9-(4-Hydroxy-3-hydroxymethyl-2-butenyl)guanine 99776-28-0
9-(4-Hydroxybutyl)guanine 23169-37-1
9-(6'-Deoxy-beta-D-allofuranosyl)guanine 85421-89-2
9-(6'-Deoxy-beta-D-allofuranosyl)hypoxanthine 85421-86-9
9-(6'-Deoxytalofuranosyl)hypoxanthine 86527-20-0
9-(beta-D-Xylofuranosyl)guanine cyclic 3',5'-monophosphate 59668-85-8
9-(beta-D-Xylofuranosyl)guanine delta-5'-monophosphate 47349-49-5
9-(beta-D-Xylofuranosyl)guanine 27462-39-1
9-(cis-3-(Hydroxymethyl)cyclopentyl)hypoxanthine 120330-37-2
9-(Dihydroxy-1,6-hex-3-yl)guanine 144175-45-1
9-(Methoxy-(4-hydroxybuten-3-yl)guanine 136083-21-1
9-(m-Tolyl)hypoxanthine 73941-32-9
9-(n-Butyl)-6-thioguanine 30546-08-8
9-[Benzyl]-1-methylisoguanine 87469-61-2
9-Arabinofuranosylguanine 38819-10-2
9-Benzyl-9-deazaguanine 151561-89-6
9-Benzylhypoxanthine 14013-11-7
9beta-D-Arabinofuranosylguanine cyclic 3',5'-phosphate 51821-84-2
9beta-D-Arabinofuranosylhypoxanthine 5'-monophosphate 54656-49-4
9-Carboxymethoxymethylguanine 80685-22-9
9-Deaza-9-(3-thienylmethyl)guanine 132138-76-2
9-Deazaguanine 65996-58-9
9-Ethylguanine 879-08-3
9-Ethylhypoxanthine 31010-51-2
9-Methylhypoxanthine 875-31-0
9-Phenylguanine 14443-33-5
Acefylline 652-37-9
Acefylline clofibrol 70788-27-1
Acyclovir monophosphate 66341-16-0
Acyclovir diphosphate dimyristoylglycerol 139701-81-8
Acyclovir sodium 69657-51-8
Acyclovir triphosphate 66341-18-2
Acyclovir 59277-89-3
Aflatoxin B1-guanine 63425-04-7
Akyltransferase 9047-03-4
Alkyltransferase, deoxyribonucleate O6-alkylguanine 92767-51-6
alpha-Amino-1,2,3,6-tetrahydro-3,7-dimethyl-2,6-dioxopurine-8-propionic acid 10154-08-2
alpha-Thiodeoxyguanosine 2133-81-5
Asteromycin M 98873-79-1
Benzylaminododecylguanine 97540-03-9
Benzylthioguanine 1874-58-4
beta-Thioguanine deoxyriboside 64039-27-6
Bis(2-((2-amino-1,6-dihydro-6-oxo-9H-purin-9-yl)methoxy)ethyl) 4-(methylsulfonyl)phenyl phosphate 125440-27-9
Bis(trimethylsilyl)hypoxanthine 17962-89-9
Buciclovir 86304-28-1
Bucyclovir triphosphate 108491-46-9
Caffeine 58-08-2
cis-(2R,5S)-9-(2-(Hydroxymethyl)-1,3-oxathiolan-5-yl)guanine 145913-82-2
cis-9-(3-(Hydroxymethyl)cyclobutyl)guanine 125962-37-0
cis-Diamminebis(O(6),9-dimethylguanine-7)platinum(II) 138180-67-3
cis-Diamminechloro(O(6),9-dimethylguanine-7)platinum(II) nitrate 154240-78-5
Cyclohexyldiamine-9-methylguanine platinum IV 118574-84-8
Deaminase, guanine 9033-16-3
Deoxyguanosine 961-07-9
Deoxyinosine monophosphate 3393-18-8
Desciclovir 84408-37-7
Dezaguanine mesylate 87434-82-0
Dichlorocyclohexyldiamine-9-methylguanine platinum IV 118574-25-7
Diguanylethane 72409-55-3
Echiguanine A 137319-25-6
Echiguanine B 137319-26-7
Fencamine 24356-67-0
Flavin-hypoxanthine dinucleotide 2466-56-0
Ganciclovir 82410-32-0
Ganciclovir monophosphonate 151006-30-3
Ganciclovir sodium 107910-75-8
Guanallene 117011-51-5
Guanine 73-40-5
Guanine ribonucleotidyl-(3'-5')-adenosine 6554-00-3
Guanine 7-oxide 5227-68-9
Guanine hydrochloride 33735-91-0
Guanine hydrochloride 635-39-2
Guanine hydroiodide sesquihydrate 73806-65-2
Guanine sulfate 10333-92-3
Guanine-3-N-oxide 18905-29-8
Guanine-3-N-oxide, hemihydrochloride 19039-44-2
Guanine-pentaammineruthenium(3+) trichloride 67848-07-1
Guanosine 118-00-3
Gustducin 147979-21-3
Hypoxallene 117011-49-1
Hypoxanthine 68-94-0
Hypoxanthine 7-N-oxide 118974-81-5
Hypoxanthine arabinoside 7013-16-3
Hypoxanthine 3-oxide 19765-65-2
Hypoxanthine-pentaammineruthenium(3+) trichloride 63313-46-2
Inosine 58-63-9
Isoguanine 3373-53-3
Isoguanosine 1818-71-9
Leteprinim 138117-50-7
Lobucavir 127759-89-1
Lyxoguanine epoxide 99614-78-5
Methylthioguanine 1320-87-2
Molybdopterin guanine dinucleotide 128007-95-4
N-(2-Diphosphorylphosphonylmethoxyethyl)guanine 130029-12-8
N-(2-Hydroxyethyl)-N-(2-(7-guaninyl)ethyl)amine 98627-74-8
N-(2-Phosphonomethoxyethylguanine) 116558-95-3
N-(Dimethylamino)methylene-9-((2-hydroxy-1-(hydroxymethyl)ethoxy)methyl)guanine 92519-15-8
N-(Guanin-8-yl)-2-aminofluorene 32366-79-3
N-(Guanin-8-yl)-N-acetyl-2-aminofluorene 14490-85-8
N2-((Chrysen-5-yl)methyl)guanine 117606-17-4
N2-(3,4-Dichlorobenzyl)guanine 133338-58-6
N2-(3-Trifluoromethylphenyl)guanine 123994-68-3
N2-(5-(Hypoxanthin-9-yl)pentyloxycarbonyl)arginine 104317-64-8
N2-(7,8,9,10-Tetrahydro-7,8,9-trihydroxybenzo(a)pyren-10-yl)guanine 60872-70-0
N2,3-Ethanoguanine 126854-10-2
N2,9-Diacetylguanine 3056-33-5
N-2-Acetylguanine 19962-37-9
N2-Dimethylguanine 1445-15-4
N2-Ethylguanine 19545-00-7
N2-Methyl-8-oxoguanine 98141-17-4
N2-Phenylguanine 40769-49-1
N2-Tetrahydropyranyl-7-hydroxyguanine 107550-41-4
N7-(2-((Hydroxyethyl)thio)ethyl)guanine 5966-31-4
N7-Hydroxyethylguanine 53498-52-5
N7-Phenylguanine 110718-94-0
Nicotinamide guanine dinucleotide 5624-35-1

Nicotinamide hypoxanthine dinucleotide

104809-38-3

Nicotinamide-hypoxanthine dinucleotide 22052-73-9
Nicotinamide-hypoxanthine dinucleotide 1851-07-6
Nitrobenzylthioguanine formycin 129970-97-4
N-Methyl-N-beta,gamma-dihydroxypropyl theophyllinyl-8-acetamide 106163-62-6
Nosantine 76600-30-1
O6-(2-((2-Hydroxyethyl)thio)ethyl)guanine 153366-11-1
O6-(2-Chloroethyl)guanine 100217-09-2
O6-(2-Cyanoethyl)guanine 118822-55-2
O6,7-Dimethylguanine 116137-82-7
O6-Ethyl-N(2),3-ethenoguanine 154086-80-3
O6-Methylguanine 20535-83-5
O6-n-Butylguanine 76412-62-9
Omaciclovir 124265-89-0
omega-(Hypoxanthin-9-yl)-pentoxycarbonyl-leucyl-methionine 126869-52-1
Oxathiolan Hypoxanth-alpha 145986-38-5
Oxathiolan Hypoxanth-beta 145986-35-2
OxathiolanG-(-)-beta 149819-75-0
OxathiolanG-(+)-alpha 149819-76-1
OxathiolanI-(-)-alpha 149819-64-7
Oxetanocin G 113269-46-8
Peldesine 133432-71-0
pemetrexed 137281-23-3
Penciclovir 39809-25-1
Penciclovir sodium 97845-62-0
Peroxy-Y-base 36238-44-5
Phosphoprotein G 25K 134324-32-6
Platinum thioguanine 69203-91-4
Polydeoxy(guanine-thymine) nucleotide 55684-98-5
Protein G 147387-25-5
Protein G 148412-03-7
Pyrimido(1,2-a)purin-10(1H)-one 103408-45-3
Queuine 72496-59-4
R-9-((2-Propyloxy)-methylphosphono)guanine 138247-60-6
Selenoguanine platinum(II) 73572-63-1
Thiamiprine 5581-52-2
Thioguanine 154-42-7
trans-(2R,5R)-9-(2-(Hydroxymethyl)-1,3-oxathiolan-5-yl)guanine 145986-44-3
trans-Oxetanocin hypoxanthine 113269-44-6
Uric acid 69-93-2
Valacyclovir hydrochloride 124832-27-5
Valacyclovir 124832-26-4
Valomaciclovir 195157-34-7
Zaprinast 37762-06-4
(+-)-9-(4'beta,5'alpha-Bis(hydroxymethyl)cyclopent-2'-en-1'beta-yl)-guanine 140440-46-6
(6-(Hydroxymethyl)-1,4-oxathian-2-yl)-guanine 132062-74-9
(6-(Hydroxymethyl)-1,4-oxathian-2-yl)-hypoxanthine 132062-70-5
(RS) 9-((2RS)-3-Fluoro-2-phosphonylmethoxypropyl)-guanine 135484-48-9
(Z)-9-(2-Hydroxymethylcyclopropylidenemethyl)guanine 200496-39-5