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