Patent ID: 8133871

Claim:
A compound represented by the following formula [I] wherein Me is a methyl group, R 1 and R 2 are the same or different and each is a hydrogen atom, an alkyl group, an acyl group, a sulfonyl group, a substituted or unsubstituted aryl-substituted alkyl group, an aryl-substituted alkyloxycarbonyl group, an alkenyl group or an alkynyl group, or R 1 and R 2 in combination form, together with the adjacent nitrogen atom, a substituted or unsubstituted alicyclic heterocyclic group, R 3 is a hydrogen atom, a substituted or unsubstituted acyl group or an aryl-substituted alkyloxycarbonyl group, A is a hydrogen atom, B is a hydroxyl group or a group represented by the following formula [II] wherein Me is a methyl group and R 4 is a hydrogen atom or an acyl group, or A and B in combination show ═O, R is a group represented by the following formula [III] wherein Me is a methyl group, R 5 and R 6 are the same or different and each is a hydrogen atom or an acyl group, or R 5 and R 6 in combination show a carbonyl group or a substituted or unsubstituted alkylene group, a substituent represented by the following formula [IV] wherein Me is a methyl group, D is O or N—OH, or D is a hydrogen atom and a hydroxyl group (—H, —OH), or a substituent represented by the following formula [V] wherein Me is a methyl group, or a pharmacologically acceptable salt thereof.