label: 5-(2-amino-3-cyano-5-oxo-5,6,7,8-tetrahydro-4H-chromen-4-yl)-1-(2-deoxypentofuranosyl)pyrimidine-2,4-(1H,3H)-dione
label_lc: 5-(2-amino-3-cyano-5-oxo-5,6,7,8-tetrahydro-4h-chromen-4-yl)-1-(2-deoxypentofuranosyl)pyrimidine-2,4-(1h,3h)-dione