| abstract |
Compounds of the formula in which: R represents: a radical of the formula -(CH2)m -X1 - (CH2)n -Z, Z represents a carboxyl radical or R represents - an -NH-CO-T radical, or else R represents - a- CH2 - N+radical which can be obtained by the action of an excess of a tertiary amine and of a strong acid, or of a derivative of this acid, on a product of the formula 120 ז' באייר התשס" א - April 30, 2001 and - N+preferably representing a pyridinium radical, X represents an oxygen or sulphur atom or an -NH-, -CO-, methylene. ethylene, alkylidene, such as vinylidene, or 1, 1-cycloalkyl group containing 3 to 6 carbon atoms, and Y represents an oxygen or sulphur atom, in the racemic form, and the optical isomers of the compounds of formula (I). |