To provide a new compound having a specific amino acid structure and useful as an antipsychotic agent, anticonvulsant, analgesic and antiemetic for the treatment of e.g. nerve degenerative diseases.
This compound is expressed by the formula I [A is carboxy, tetrazolyl, sulfa, etc.; B is single bond, a 1-6C alkylene or a 2-6C alkenylene; R1 is H, OH, a halogen or a group of the formula A-B; X is B except for single bond, etc.; Y is a group of the formula II (R2 and R3 are each a halogen, nitro, cyano, a 1-6C alkyl, etc.; Q is O, S, vinylene, etc.; Z is nitrilo or methylidyne; (m) and (n) are each 0-3), etc.; X is B except for single bond, etc., when Z is nitrilo], its salt or ester, e.g. 2-amino-2-(4-carboxy-3-hydroxyphenyl)-3-(9H- xanthen-9-yl)pfopanoic acid. The compound of the formula I can be produced by hydrolyzing a compound of the formula III.
HARRIS JOHN RICHARD
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