Benzoic acid (2R,4R,5S,6S)-4-(bis-ethylsulfanyl-methyl)-6-[(R)-(tert-butyl-diphenyl-silanyloxy)-methylcarbamoyl-methyl]-2-(4-methoxy-phenyl)-[1,3]dioxan-5-yl ester

1,2-O-isopropylidene-β-D-idurono-3,6-lactone