Patent ID: 6861444

Claim:
A compound of the general formula (I): or a salt thereof, wherein R 1 represents a hydrogen atom, a hydroxyl group or a halogen atom; R 2 represents NHSO 2 R 3 or SO 2 NR 4 R 4′ ; R 3 represents an alkyl group containing from 1 to 6 carbon atoms, a benzyl group, a phenyl group or NR 4 R 4′ ; R 4 and R 4′ may be the same or different and each independently represents a hydrogen atom or an alkyl group containing from 1 to 6 carbon atoms; R 5 and R 6 may be the same or different and each independently represents a hydrogen atom, an alkyl group containing from 1 to 6 carbon atoms, an optionally substituted phenyl group or an optionally substituted benzyl group; X represents NH, a sulfur atom, an oxygen atom or a methylene group; Y represents an oxygen atom, NR 7 , a sulfur atom, a methylene group or a bond; R 7 represents a hydrogen atom, an alkyl group containing from 1 to 6 carbon atoms, or an acyl group containing from 1 to 6 carbon atoms; and * represents an asymmetric carbon atom.