Patent ID: 7038046

Claim:
A compound of formula (1) wherein R 1 is a C 1 -C 18 alkyl, C 2 -C 18 alkenyl, C 6 -C 10 aryl or C 6 -C 10 heteroaryl radical each unsubstituted or mono- or poly-substituted by hydroxy, C 1 -C 18 alkyl, C 1 -C 18 alkoxy, amino, C 1 -C 5 monoalkyl-amino or by di-C 1 -C 5 alkylamino; C 5 -C 7 cycloalkyl or C 5 -C 7 cycloalkenyl each unsubstituted or substituted by C 1 -C 5 alkyl; —OR′; or —NR′R″; R 2 is hydrogen; a C 1 -C 18 alkyl, C 2 -C 18 alkenyl, C 6 -C 10 aryl or C 6 -C 10 heteroaryl radical each unsubstituted or mono- or poly-substituted by hydroxy, C 1 -C 18 alkoxy, cyano, amino, C 1 -C 5 monoalkylamino or by di-C 1 -C 5 alkylamino; —OR′; or —NR′R″; or R 1 and R 2 together form a 5- to 7-membered carbocyclic or heterocyclic ring; A is C 1 -C 5 alkyl; an unsubstituted or hydroxy-, C 1 -C 18 alkyl- or C 1 -C 18 alkoxy-substituted C 6 -C 10 aryl or heteroaryl radical; or a radical of formula (1a) R′ and R″ are each independently of the other hydrogen; unsubstituted or mono- or poly-hydroxy-, halo-, C 1 -C 18 alkyl-, C 1 -C 18 alkoxy-, amino- or quaternary ammonium group-substituted C 1 -C 18 alkyl, C 5 -C 7 cycloalkyl or phenyl; R 3 is hydrogen; or C 1 -C 6 alkyl; and n is 0 or 1.