Patent ID: 7501451

Claim:
A compound of formula A: wherein Ar is thiophen-2,5-diyl, R 1 , R 2 are each independently selected from the group consisting of hydrogen, substituted or unsubstituted C 1-12 -alkyl, substituted or unsubstituted C 2-12 -alkenyl, substituted or unsubstituted C 2-12 -alkynyl, and substituted or unsubstituted C 3-12 -cycloalkyl; wherein the substituent is selected from the group consisting of hydroxy, halogen, C 3-12 -cycloalkyl, alkoxy, alkylsulfanyl, acyloxy, alkoxycarbonyl, acyl, C 1-6 -alkyl-NH—C(O)—, C 1-6 -alkyl-C(O)NH— and —NR 3 R 4 ; or alternatively, R 1 is hydrogen, and R 2 is alkoxy, C 2 -C 12 -alkenyloxy, phenoxy, or phenoxy substituted with methyl, methoxy, halogen, nitro, cyano, trifluoromethyl, ethenyl or —C(O)—O—CH 3 , R 3 and R 4 are each independently selected from the group consisting of hydrogen and C 1-6 -alkyl, or alternatively R 3 and R 4 together with the nitrogen-atom to which they are attached form a ring, which ring is monosubstituted by oxo and which ring optionally contains an additional heteroatom; or a pharmaceutically acceptable salt thereof.