4-amino-1-[3,4-dihydroxy-5-(hydroxymethyl)-2-tetrahydrofuranyl]-2-pyrimidinone 4-amino-1-[3,4-dihydroxy-5-(hydroxymethyl)tetrahydrofuran-2-yl]pyrimidin-2(1H)-one 4-amino-1-[3,4-dihydroxy-5-(hydroxymethyl)tetrahydrofuran-2-yl]pyrimidin-2-one Cytosine-beta-D-arabinofuranose hydrochloride -D-arabinofuranoside hydrochloride 4-Amino-1-((2R,3S,4S,5R)-3,4-dihydroxy-5-(hydroxymethyl)-tetrahydrofuran-2-yl)pyrimidin-2(1H)- arabinosylcytosinehydrochloride ara-chydrochloride