1,7-dimethyl 2,6-bis[(tert-butoxycarbonyl)amino]-2,3,4,6-tetradeoxyheptarate InChI=1/C19H34N2O9/c1-18(2,3)29-16(25)20-11(14(23)27-7)9-10-12(22)13(15(24)28-8)21-17(26)30-19(4,5)6/h11-13,22H,9-10H2,1-8H3,(H,20,25)(H,21,26 heptaric acid, 2,3,4,6-tetradeoxy-2,6-bis[[(1,1-dimethylethoxy)carbonyl]amino]-, 1,7-dimethyl ester