| abstract |
The compounds of the formula <CHEM> wherein R is hydrogen, lower alkyl, benzyl or pivaloyloxymethyl; R<1> and R<2> are, independently, hydrogen, lower alkyl, lower alkoxy, trifluoromethyl, trifluoromethoxy, methanesulfonylamino, acetylamino, or halo, or when taken together R<1> and R<2> represent a methylenedioxy grouping; and the pharmacologically acceptable salts thereof are NMDA antagonists useful in the treatment and prevention of central nervous system related pathological conditions resulting from overstimulation by excitatory amino acids. Processes for preparing the compounds and pharmaceutical compositions containing them are also covered. |