Patent ID: 7994182

Claim:
Compounds of general formula (I) and their pharmaceutically acceptable salts thereof wherein R 1 stands for hydrogen or a group of general formula (a) and k is 1, 2, 3, or 4, n is 0 or 1, Q stands for oxyl group (O.) or hydrogen, Ra and Rc independently from each other stand for hydrogen or C 1-6 alkyl group, Rb and Rd independently from each other stand for C 1-6 alkyl group and the broken line stands for an optional valence bond; R 2 stands for a) hydrogen or C 1-6 alkyl group, if R 1 is other than hydrogen, and b) if R 1 is a hydrogen, then R 2 stands for (i) a group of general formula (b) wherein the meanings of k, n, Q, Ra, Rb, Rc, Rd and the broken line are as given above, or (ii) a group of general formula (c) wherein k is 1, 2, or 3; and R3 and R4 together with the attached nitrogen form a group of general formula (e) wherein p is 0 or 1 and R′a, R′b, R′c and R′d independently from each other stand for hydrogen or C 1-6 alkyl group, or (iii) a group of general formula (d) wherein the meanings of n, Q, Ra, Rb, Rc, Rd, and the broken line are as given above and m is 0, 1, 2 or 3.