Patent ID: 7265245

Claim:
A compound of structural formula (I): in which R 1 is a —NR a R b group, where R a and R b , independently, are a hydrogen atom or a C 1 -C 6 alkyl group; —OR C group, where R C is a hydrogen atom or a C 1 -C 6 alkyl group; a glycosyl; a C 1 -C 6 polyhydroxyalkyl; or a —NH—CH(R d )—COOR e group, where R d is a side chain of one of the 20 natural alpha-amino acids in either of their two enantiomerically pure forms L or D, and R e is a hydrogen atom or a C 1 -C 6 alkyl group; and R 2 is a hydrogen atom, a C 1 -C 6 alkyl group, a glycosyl; a C 1 -C 6 polyhydroxyalkyl; —C(═O)—R f group, where R f is a C 1 -C 6 alkyl group; or a —CH 2 —COO—R g group, where R g is a hydrogen atom or a C 1 -C 6 alkyl group; and pharmaceutically acceptable salts thereof.