4-O-acetyl-1,5-anhydro-O-(methoxycarbonylmethyl)di-O-methylglucitol, 2-O-(methoxycarbonylmethyl)-3,6-di-O-methyl isomer
4-o-acetyl-1,5-anhydro-o-(methoxycarbonylmethyl)di-o-methylglucitol, 2-o-(methoxycarbonylmethyl)-3,6-di-o-methyl isomer