Patent ID: 7351700

Claim:
A compound of the formula wherein X is —S— or —NH—; R 1 is alkyl, alkenyl, arylalkyl, arylalkenyl or aryl-O-alkyl, and wherein the aryl groups are optionally substituted by one or more substituents selected from the group consisting of lower alkyl, lower alkoxy, halogen and lower halogen-alkyl; R 2 is hydrogen, lower alkyl or cycloalkyl; R 3 /R 4 together with the N-atom to which they are attached form a non aromatic 5, 6 or 7 membered ring, which optionally contains in addition to the N-atom, one additional heteroatom selected from the group consisting of O, S and N, and wherein the ring is optionally substituted by hydroxy, lower alkyl, lower alkoxy, —NR 2 , —CONR 2 , —CO-lower alkyl or benzyl; or R 3 /R 4 together with the N-atom to which they are attached form a heterocyclic ring system, containing two or three rings and which optionally contains one or two additional heteroatoms selected from the group consisting of N and O, and which has no more than 20 carbon atoms; R is hydrogen or lower alkyl; R 5 is hydrogen or alkyl; or a pharmaceutically suitable acid addition salt thereof.