| abstract |
The invention concerns compounds of general formula (I) in which U represents a group of general formulas (A) or (B), formulas in which V represents a hydrogen or halogen atom, a (C1-C3) alkyl group or one or two (C1-C3) alkoxy groups; W and X represent each, respectively, either two oxygen atoms, or an oxygen atom and CH2 group, or a CH2 group and an oxygen atom, or an oxygen atom and a CO group; n represents 1 or 2; R represents either a propyl group when U represents a group of general formula (A), or a hydrogen atom, or a (C1-C3) alkyl group when U represents a group of general formula (B); Y represents one or several atoms or groups selected among the following: hydrogen, halogen, (C1-C3) alkyl and (C1-C3) alkoxy or the groups selected among: hydrogen, halogen, (C1-C3) alkyl and (C1-C3) alkoxy; Z represents two hydrogen atoms or one oxygen atom. |