N(5)-Hydroxy-L-arginine

N(5)-Methyl-N(5)-formyl-2, 5, 6-triamino-4-hydroxypyrimidine

N(5)-Piperidine-amiloride

N(6), N(6)-Dimethyladenine

N(6), N(6)-Dimethyladenosine

N(6), N(6)-Dimethyladenylyl(3'-5')N(6), N(6)-dimethyladenosine

N(6), O(2')-Di(ethyl-2-diazomalonyl)adenosine-3', 5'-cyclic monophosphate

N(6), O(2)-Dimethyladenosine

N(6), O(2)-Dipivaloyl cyclic amp

N(6)-((6-Aminohexyl)carbamoylmethyl)ATP

N(6)-((Chrysen-5-yl)methyl)adenine

N(6)-((dimethylamino)methylene)mitomycin C

N(6)-(1, 3-Dimethyl-2-butenyl)adenine

N(6)-(1-Carboxyethyl)lysine

N(6)-(12-Methylbenzanthracenyl-7-methyl)deoxyadenosine

N(6)-(2, 2, 6, 6-Tetramethyl-1-oxypiperidin-4-yl)adenine

N(6)-(2, 2-Diphenylethyl)adenosine

N(6)-(2, 3-Dihydroxypropyl)lysine

N(6)-(2-(4-chlorophenyl)bicyclo(2.2.2.)-octyl)(3)-adenosine

N(6)-(2-Carboxyethyl)adenine