8-(3-Chlorostyryl)caffeine

8-(3-Diethylaminopropoxy)psoralen

8-(3-Methoxy-4-(phenylsulfinyl)phenyl)pyrazolo(1, 5-a)-1, 3, 5-triazin-4(3H)-one

8-(3-Pyridyl)theophylline

8-(3-Sulfophenyl)theophylline

8-(3-tert-Butylamino-2-hydroxypropoxy)-3, 4-dihydro-3-oxo-2H-(1, 4)-benzothiazine

8-(4-(((((2-((((3-Isothiocyanatophenyl)amino)(thiocarbonyl))amino)ethyl)amino)carbonyl)methyl)oxy)phenyl)-1, 3-dipropylxanthine

8-(4-((2-Aminoethyl)aminocarbonylmethyloxy)phenyl)-1, 3-dipropylxanthine

8-(4-(4-Fluorophenyl)-4-oxobutyl)-2, 4-dimethyl-2, 8-diazaspiro(4.5)decane-1, 3-dione

8-(4-(4-Fluorophenyl)-4-oxobutyl)-2, 4-dimethyl-2, 8-diazaspiro(4.5)decane-1, 3-dione hydrobromide

8-(4-Amino-1-piperidinyl)-9-ethyl-6, 11-dihydro-6, 6-dimethyl-11-oxo-5H-benzo(b)carbazole-3-carbonitrile

8-(4-Azidophenacyl)thio-cyclic GMP

8-(4-Benzenesulfonylamino)quinoline

8-(4-Benzylphenyl)-9-sulfanylidene-1, 6, 8-triazabicyclo(4.3.0)nonan-7-one

8-(4-Bromo-2, 3-dioxobutylthio)NAD

8-(4-Carboxymethyloxy)phenyl-1, 3-dipropylxanthine

8-(4-Chloro-phenylthio)-2'-O-methyladenosine-3'-5'-cyclic monophosphate

8-(4-Chlorophenyl)thiazolo(3, 2-a)pyrimidine-5, 7-dione

8-(4-Chlorophenylthio)guanosine 3', 5'-cyclic monophosphorothioate

8-(4-Ethoxy-3-methoxyphenyl)-1, 5-diazabicyclo(3.2.1)octane