adenine
{9-[(1R,4S)-4-(Benzenesulfonyl-nitro-methyl)-cyclopent-2-enyl]-9H-purin-6-yl}-carbamic acid methyl ester
Carbonic acid (1R,4S)-4-(6-methoxycarbonylamino-purin-9-yl)-cyclopent-2-enyl ester methyl ester
(1R,4S)-4-(6-Amino-purin-9-yl)-cyclopent-2-enol
<(phenylsulfonyl)nitromethyl>lithium