SYNTHETIC EXCITATORY AMINO ACIDS, PREPARATION METHOD THEREOF, INTERMEDIATES FOR THEIR PREPARATION, AND PHARMACEUTICAL COMPOSITIONS CONTAINING SAME

摘要

Compounds of Formula (I) wherein X is (CH 2) n wherein n is 1; R 2 is CO 2 R 4 and R 3 is hydrogen or R 2 is hydrogen and R 3 is CO 2 R 4; R 1 and R 4 are independently hydrogen, C 1-10 alkyl, C 2-10 alkenyl, aryl or arylalkyl, or a pharmaceutically acceptable salt thereof; how to prepare them; an intermediate for their preparation and a pharmaceutical composition containing the same