1-(2,5-Dideoxy-beta-erythro-hexofuranosyl)cytosine 1-(2,5-Dideoxy-beta-hexofuranosyl)cytosine 1-Dhfcy 2(1H)-Pyrimidinone, 4-amino-1-(2,5-dideoxy-beta-D-erythro-hexofuranosyl)- 61221-85-0