wherein R¹ and R² each independently is a hydrogen atom, or an alkyl group, an alkenyl group, an alkynyl group, an acyl group, an aryl group or an aralkyl group which may have one or two of the following substituents (I) or (II), or R¹ and R² are taken together to be a substituent (III):

wherein R⁸ to R¹² each independently is an alkyl group, an alkenyl group, an alkynyl group, an acyl group, an aryl group or an aralkyl group;

with the proviso that both R¹ and R² are not a hydrogen atom at the same time;

R³, R⁴ and R⁷ each independently is a hydroxyl group or a hydroxyl group having a substituent; and

R⁵ and R⁶ each independently is a hydrogen atom, a hydroxyl group or a hydroxyl group having a substituent, with the proviso that when one of R⁵ and R⁶ is a hydrogen atom, the other is a hydroxyl group or a hydroxyl group having a substituent,

wherein the hydroxyl group having a substituent at positions R³-R⁷ is a hydroxyl group where the hydrogen of the hydroxyl group is replaced with a substituent selected from the group consisting of an aralkyl group, a silyl group, an alkanoyl group, an aroyl group, an alkoxyalkyl group, and a aralkyloxyalkyl group or wherein two hydroxyl groups at positions R³-R⁷ together form a substituent selected from the group consisting of an alkylidene group, an isopropylidene group, and an aralkylidene group,

wherein said salt of a carba-sugar amine derivative is a hydrochloride or sulfate salt.