Use of a compound of formula (I): ** Formula ** where: - the dashed line --- represents a saturated or unsaturated bond； - Z represents a CH unit； - Y represents a unit C (R5) x - R5 represents a hydrogen atom, a (C1-C5) alkyl group, a nitrile, a carboxamide or Ar, being x 1 or 2； - R6 represents a hydrogen atom, a (C1-C5) alkyl or an Ar group； - R4, different from R5, represents a hydrogen atom, a nitrile group, an ethyne, a (C1-C5) alkyl or a carboxamide； provided that: or when R4 represents a hydrogen atom, then R5 represents a nitrile group and R6 represents an Ar group, and when R4 is different from a hydrogen atom, then one from R5 and R6, different from each other , is an Ar group； - R7 represents a hydrogen atom or a (C1-C5) alkyl group； - R1, R2 and R3, independently of each other, represent a hydrogen atom, a halogen, a hydroxyl, an amine or a (C1-C10) alkoxy radical, phenyl, benzyloxy, acetate, methylcarbamate, (C1-) alkoxy C10) acetate, said radical being optionally substituted by at least one halogen or a (C1-C10) alkoxy group； - R2 and R3 can form a condensed heterocycle with the phenyl cycle, such as a benzoxazole, optionally substituted by a (C1-C5) alkyl group； - Ar represents an aromatic radical selected from: ** Formula ** representing R 'a hydrogen atom, a halogen, a cyano group, a (C1-C5) alkyl or a (C1-C10) alkoxy, R' 'and R '' '', independently of each other, represents a hydrogen atom, a halogen or a (C1-C5) alkyl group, and R '' 'represents a hydrogen atom or a (C1-C10) alkoxy group； * * Formula ** provided that when Ar is (B), R4 represents a nitrile group and R1, R3, R5 and R7 represent a hydrogen atom and: or if the broken line is an unsaturated bond, then R2 is different from a benzyloxy group, or if the dashed line is a saturated bond, then R2 is different from a hydrogen atom； ** Formula ** with: - Ra and Rc, independently of each other, represent a hydrogen atom, a halogen , a nitro group, an amine, an amide or a (C1-C5) alkoxy； - Rb
