A compound of formula wherein A is selected from the group consisting of H and C 1-6 -alkyl; R 1 and R 2 are independently selected from the group consisting of H, C 1-6 -alkyl and C 3-6 -cycloalkyl, wherein at least one of R 1 or R 2 is C 1-6 -alkyl or C 3-6 -cycloalkyl, wherein the C 1-6 -alkyl or the C 3-6 -cycloalkyl is optionally substituted with halogens or MeO-, or wherein R 1 and R 2 together form a 2- to 5-membered alkylene-bridge optionally substituted with halogens incorporating 0 to 2 heteroatoms independently selected from the group consisting of N, O and S; W is selected from the group consisting of a mono- or bicyclic aryl, a mono- or bicyclic heteroaryl, a mono- or bicyclic heterocyclyl and a mono- or bicyclic cycloalkyl, wherein each of these ring systems are optionally substituted with one or more R 3, and wherein the heteroaryl comprises up to 4 heteroatoms and one or two 5- or 6-membered ring(s); R 3 is independently selected from the group consisting of C 1-6 -alkyl, C 3-8 -cycloalkyl, C 1-6 -alkyl-O-, benzyl, halogen, HO-, NC-, mono- or bicyclic heteroaryl, and 5- or 6-membered monocyclic heterocyclyl containing one heteroatom selected from the group consisting of N, O or S r, wherein the heteroaryl contains up to 4 heteroatoms and one or two 5- or 6-membered rings(s) and r is 0, 1 or 2, wherein the C 1-6 -alkyl, C 3-8 -cycloalkyl, C 1-6 -alkyl-O-, benzyl, heteroaryl and the heterocyclyl are optionally substituted with halogens, HO-, acetyl, C 1-6 -alkyl-O-, oxo, R 4 -S 2 -, with R 4 being aryl, C 3-6 -cycloalkyl and/or C 1-6 -alkyl; Y is selected from the group consisting of a bond, -CH 2 -, -CH 2 CH 2 -, and -CH 2 O-; or a salt of any of the above compounds. A is selected from the group consisting of H and C 1-6 -alkyl; R 1 and R 2 are independently selected from the group consisting of H, C 1-6 -alkyl and C 3-6 -cycloalkyl, wherein at least one of R 1 or R 2 is C 1-6 -alkyl or C 3-6 -cycloalkyl, wherein the C 1-6 -alkyl or the C 3-6 -cycloalkyl is optionally substituted with halogens or MeO-, or wherein R 1 and R 2 together form a 2- to 5-membered alkylene-bridge optionally substituted with halogens incorporating 0 to 2 heteroatoms independently selected from the group consisting of N, O and S; W is selected from the group consisting of a mono- or bicyclic aryl, a mono- or bicyclic heteroaryl, a mono- or bicyclic heterocyclyl and a mono- or bicyclic cycloalkyl, wherein each of these ring systems are optionally substituted with one or more R 3, and wherein the heteroaryl comprises up to 4 heteroatoms and one or two 5- or 6-membered ring(s); R 3 is independently selected from the group consisting of C 1-6 -alkyl, C 3-8 -cycloalkyl, C 1-6 -alkyl-O-, benzyl, halogen, HO-, NC-, mono- or bicyclic heteroaryl, and 5- or 6-membered monocyclic heterocyclyl containing one heteroatom selected from the group consisting of N, O or S r, wherein the heteroaryl contains up to 4 heteroatoms and one or two 5- or 6-membered rings(s) and r is 0, 1 or 2, wherein the C 1-6 -alkyl, C 3-8 -cycloalkyl, C 1-6 -alkyl-O-, benzyl, heteroaryl and the heterocyclyl are optionally substituted with halogens, HO-, acetyl, C 1-6 -alkyl-O-, oxo, R 4 -S 2 -, with R 4 being aryl, C 3-6 -cycloalkyl and/or C 1-6 -alkyl; Y is selected from the group consisting of a bond, -CH 2 -, -CH 2 CH 2 -, and -CH 2 O-; or a salt of any of the above compounds.