| abstract |
Compounds with the following formula: (there are formulas), their optical isomers, salts, preparations and medicaments containing them; In the above formula, R represents a chain as follows: (A) (B) R 1 is a methyl or ethyl; R2 is either an aromatic root substituted when required, or a heteroaromatic root substituted if required; R3 and R4, whether identical or different, are an aromatic root substituted if necessary, or a heteroaromatic root substituted if required; R 'represents a hydrogen atom or a -CO- alkyl radical. |