| abstract |
Compound of formula I: **(See formula)** and its salts, in which n is an integer from 1 to 6; X is CO or CH2; Y is NR1R2 or R2 or **(See formula)** R1 is H or alkyl or alkyl-aryl; R2 is Z-L-R3; Z is nonexistent, CO or CH2; L is nonexistent, CH=CH or (CH2)m; m is an integer from 1 to 6; R3 is phenyl, substituted with at least one OH group and one or more substituents selected from OH, C1 to C4 alkoxy, and C1 to C4 alkyl, or R3 is N-pyridinonyl, substituted with at least one OH group and optionally with one or more substituents selected from OH, C1 to C4 alkoxy and C1 to C4 alkyl. |