for the following products
1-[(2R,3R,5R)-3,4-dihydroxy-5-(hydroxymethyl)oxolan-2-yl]-1,2,3,4-tetrahydropyrimidine-2,4-dione | Ara-U | Arabinofuranosyl-uracil | Arabinouridine | Spongouridine | Uracil 1-beta-D-arabinofuranoside and 1-beta-D-Arabinofuranosyl uracil
