(2R,3S,4R,5S)-3-(benzyloxy)-5-cyano-1,1-bis(ethylthio)-4,5-dihydroxypentan-2-yl pivalate

methyl 2-O-pivaloyl-3-O-benzyl-L-idouronate di(ethylthio)acetal

methyl ethyl-2-O-pivaloyl-3-O-benzyl-4-O-levulinoyl-1-thio-L-idopyranosiduronate