esidue, R4 is an R3 group, cyano or a C1 -C10 -alkanoyl residue, or R3 and R4 jointly with the inclusion of N is a 5- or 6-membered heterocyclic ring wherein the ring can additionally contain a further heteroatom N, O, or S; R11 is a perfluorinated C1 -C4 -alkyl group; A and B either jointly are a further bond between C4 and C5, or A is an ??-hydroxy group and B is H; X is a keto or oxime group; a