Carbamic acid,[(1R,4Z,8S,12S,13E)-8-[[4,6- dideoxy-2-O-[2,4-dideoxy-4-(ethylamino)-3- O-methyl-R-L-threo-pentopyranosyl]-4-[[(2,- 6-dideoxy-4-S-methyl-4-thio-â-D-ribohexopyranosyl) oxy]amino]-â-D-glucopyranosyl]- oxy]-12-[[2,6-dideoxy-3-O-[4,5-dimethoxy-