Patent ID: 7253206

Claim:
A compound of formula (I-A) or of formula (I-B), wherein: X is a group of formula (I-C) or of formula (I-D), wherein: R 1 and, if present, R 2 simultaneously are H, C 1 -C 6 -alkyl, C 2 -C 6 -alkenyl or C 2 -C 6 -alkynyl, wherein said C 1 -C 6 -alkyl, C 2 -C 6 -alkenyl or C 2 -C 6 -alkynyl substituents are optionally mono- or disubstituted by —OH, ═O, —O—C 1 -C 6 -alkyl, —O—C 2 -C 6 -alkenyl, —C 6 -C 10 -aryl, —NH—C 1 -C 6 -alkyl, —NH—C 2 -C 6 -alkenyl, —NH 2, or halogen, wherein said —O—C 1 —C 6 —alkyl, —O—C 2 —C 6 —alkenyl, —C 6 —C 10 —aryl, —NH—C 1 —C 6 —alkyl, and —NH—C 2 —C 2 —C 6 —alkenyl substituents are optionally substituted by —CN, —NH—C(O)—(C 1 —C 6 —alkyl) or =NOH, or a stereoisomeric form of the compound of formula (I-A) or (I-B), or mixtures of the steroisomeric forms thereof in any ratio, or a pharmaceutically acceptable salt thereof, and with the proviso that when R 1 is H, X is the group of formula (I-C) and with the proviso that both R 1 and R 2 are not simultaneously H.