Patent ID: 6964982

Claim:
A method for reducing neuronal death in nervous system injuries caused by activation of N-methyl-D-aspartate glumate receptors, entry and accumulation of Zn +2 , or free radical damage comprising administering to a patient or a mammal a therapeutically appropriate amount of one or more of compounds represented by the following formula (I) or pharmaceutically acceptable salts thereof: wherein, X is CO, SO 2 or (CH 2 ) n , wherein n is an integer of 1 to 5; R 1 is hydrogen, alkyl or alkanoyl; R 2 is hydrogen or alkyl; R 3 is hydrogen or an acetoxy group; and R 4 is phenyl group which is unsubstituted or substituted with one or more of the group consisting of nitro, halogen, haloalkyl, and C 1 -C 5 alkoxy.