3'-O,4'-C-methyleneuridine

Toluene-4-sulfonic acid (1R,3R,4R,5S)-3-(2,4-dioxo-3,4-dihydro-2H-pyrimidin-1-yl)-4-hydroxy-2,6-dioxa-bicyclo[3.2.0]hept-1-ylmethyl ester