| 摘要 |
<p>The invention concerns a compound of formula (I) wherein: (a) represents a single or double bond; R1 represents a hydrogen atom or a hydroxy, alkoxy, acyloxy, alkylsulphonyloxy, arylsulphonyloxy or arylalkoxy group; R2 represents a hydrogen atom or an alkyl group; R3 and R4, identical or different, represent each a hydrogen, a halogen atom or an alkyl, hydroxy or alkoxy group; Ak represents an alkylene chain; R5, R6 and R7, identical or different, represent each an alkyl group, or R5, R6 and R7 together with the nitrogen which bears them, form a saturated or unsaturated nitrogenous heterocycle; X represents a halogen atom; and its optical isomers when they exist.</p> |
