label: 4-Amino-1-[5-O-[(2R, 4S)-2-oxido-4-(4-pyridinyl)-1, 3, 2-dioxaphosphorinan-2-yl]-b-D-arabinofuranosyl]-2(1H)-pyrimidinone
label_lc: 4-amino-1-[5-o-[(2r, 4s)-2-oxido-4-(4-pyridinyl)-1, 3, 2-dioxaphosphorinan-2-yl]-b-d-arabinofuranosyl]-2(1h)-pyrimidinone