Abstract: Tryptophan derivatives represented by the general formula: ##STR1## in which R denotes an acetyl group, M denotes an alkali metal or alkaline-earth metal (more particularly lithium or magnesium) having the value n or the quaternary ammonium cation of one of the following nitrogenous organic bases: morpholine and monoethanolamine; n is an integer equal to 1 or 2, and the formula (I) derivatives can be in the racemic DL form or the optically active L(+) form, the drugs being useful inter alia as agents having an increased effect on the central nervous system.

Abstract: The present invention relates to derivatives of taurine represented by the general formula:(CH.sub.3 --CO--NH--CH.sub.2 --CH.sub.2 --SO.sub.3).sub.n.sup.- M.sup.+in which M is an alkali- metal such as potassium, lithium or an alkaline-earth metal such as calcium and magnesium, of valency n, n being equal to 1 or 2, or the quaternary ammonium cation of a nitrogenous organic base, to the process for preparation thereof from taurine and application thereof as drugs having a reinforced neuro-muscular activity.