| abstract |
The invention concerns compounds of formula (1) wherein: R represents an chain (A) or (B); R1 is methyl or ethyl; R2 is either an optionally substituted aromatic or an optionally substituted heteroaromatic; R3 and R4, identical or different, are either an optionally substituted aromatic or an optionally substituted heteroaromatic; R' represents a hydrogen atom or a -CO-alk radical, their optical isomers, their salts, their preparation and medicines containing them. |