Patent ID: 6962943

Claim:
A compound of formula (I) wherein R, R 2 and R 3 are each, independently, H, or C 1 -C 6 -alkyl, C 2 -C 6 -alkenyl or C 2 -C 6 -alkynyl, wherein the alkyl, alkenyl and alkynyl are straight-chain or branched and are optionally substituted, once or twice, by: —OH, ═O, —O—C 1 -C 6 -alkyl, wherein the alkyl is straight-chain or branched, —O—C 2 -C 6 -alkenyl, wherein the alkenyl is straight-chain or branched, —aryl, —NH—C 1 -C 6 -alkyl, wherein the alkyl is straight-chain or branched, —NH—C 2 -C 6 -alkenyl, wherein the alkenyl is straight-chain or branched, —NH 2 or halogen, wherein the alkyl, alkenyl and aryl portions of —O—C 1 -C 6 -alkyl, —O—C 2 -C 6 -alkenyl, -aryl, —NH—C 1 -C 6 -alkyl, and —NH—C 2 -C 6 -alkenyl can be further substituted by —CN, -amide or -oxime; R4 is C 1 -C 6 -alkyl or C 2 -C 6 -alkenyl, wherein the alkyl and alkenyl can be straight-chain or branched and are optionally substituted once or twice by: —OH, ═O, —O—C 1 -C 6 -alkyl, wherein the alkyl is straight-chain or branched, —O—C 2 -C 6 -alkenyl, wherein the alkenyl is straight-chain or branched, -aryl, —NH—C 1 -C 6 -alkyl, wherein the alkyl is straight-chain or branched, —NH—C 2 -C 6 -alkenyl, wherein the alkenyl is straight-chain or branched, —NH 2 or halogen, wherein the alkyl, alkenyl and aryl portions of —O—C 1 -C 6 -alkyl, —O—C 2 -C 6 -alkenyl, -aryl, —NH—C 1 -C 6 -alkyl, and —NH—C 2 -C 6 -alkenyl can be further substituted by —CN, -amide or -oxime; R 5 is H or methyl; and X, X 2 , X 3 , X 4 and X 5 , are each independently O, NH, N—C 1 -C 6 -alkyl, N—C 2 -C 6 -alkenyl, N—C 2 -C 6 -alkynyl, N-acyl, N-aryl, N—O—R or S, or a stereoisomeric form or a tautomeric form of the compound of formula (I), or a physiologically tolerated salt of the compound of formula (I) or of a stereoisomeric form or of a tautomeric form of the compound of formula (I).