Patent ID: 8575193

Claim:
A compound of formula I wherein R1 is R2 is H; R3 is hydrogen, —OR4, —NR5R6, or an optionally substituted alicyclic, heteroalicyclic, aromatic or heteroaromatic radical, wherein the alicyclic radical is a 3- to 6-membered monocyclic group, the heteroalicyclic radical is a 5- to 6-membered monocyclic group containing one or two heteroatoms, each of which is selected from the group consisting of nitrogen, oxygen and sulfur, the aromatic radical is phenyl or naphthyl, the heteroaromatic radical is a 5- to 6-membered monocyclic group or a 9- to 10-membered bicyclic group containing one or two heteroatoms, each of which is selected from the group consisting of nitrogen, oxygen and sulfur, and the substituents of the optionally substituted alicyclic, heteroalicyclic, aromatic or heteroaromatic radical are each selected from the group consisting of halogen, 1-4C alkyl, 1-4C alkoxy and phenyl; R4 is hydrogen, 1-4C alkyl or a substituted or unsubstituted alicyclic, heteroalicyclic, aromatic or heteroaromatic group, wherein each of these groups is as defined as in R3; R5 and R6 are each independently H or 1-4C alkyl; X is a single bond, —CH═CH—, —C≡C—, —NH—, oxygen or sulfur; Y is —NH—, oxygen or sulfur; r is 1 or 2, one of s and u is 0 and the other is 1, t is 0, 1, 2, 3, 4or 5, and v is 0, 1, 2, 3 or 4; or a salt thereof.