| abstract |
A compound of formula I, ** Formula ** in which the wavy lines indicate optional cis or trans stereochemistry; R1 represents H, NO2 or -N (R2a) R2b; a represents 1, 2 or 3; A represents C2-6 alkylene; D represents Het1 or -N (R3a) R3b; Het1 represents a five to seven membered heterocyclic group containing at least one N atom and optionally one or more heteroatoms selected from N, O and S, the heterocyclic group being optionally substituted with one or more substituents selected from C1-4 alkyl and C1 alkoxy -4; R3a and R3b represent C1-4 alkyl; Qa and Qb independently represent naphthyl (optionally substituted with one or more substituents selected from halo, nitro, N (R2a) R2b, C1-3alkyl and C1-3alkoxy), Het3, or a structural fragment of formula Ia, Id or If, each Qc independently represents, in each case when used herein, a structural fragment of formula Ia or Id. |