Patent ID: 7459558

Claim:
A compound of the formula wherein A is X is —CO— or —NH—CO—; and Y is —NH—Z 2 —Q— or piperazine, Q is selected from the group consisting of a single bond, O—Z 3 , R 3 —N—Z 3 and S—Z 3 , and Z 2 and Z 3 are independently a bond or alkylene of 1 to 6 carbon atoms and R 3 is hydrogen or alkyl of 1 to 6 carbon atoms; B is alkyl of 1 to 6 carbon atoms or carbocyclic or heterocyclic aryl with 5 to 6 members containing 1 to 4 heteroatoms selected from the group consisting of O, S and N, the aryl being optionally substituted by at least one member selected from the group consisting of alkyl, alkenyl and alkoxy of up to 6 carbon atoms; R 6 is hydrogen or OH; and salts thereof.