7-氨基-1,5-二氢-4H-吡咯并[3,2-D]嘧啶-4-酮

(1S)-1-(7-N-benzyloxymethyl-9-deaza-6-O-methylhypoxanthin-9-yl)-1,4-dideoxy-1,4-imino-2,3-O-isopropylidene-D-ribitol