The invention relates to new compounds, 3-phenylpropionic acid derivatives of formula (I) wherein W represents COOH group or its bioisosters, or --COO--C.sub.1 C.sub.4-alkyl group; Y represents NH, N--C.sub.1 C.sub.10-alkyl, O, or S; X represents O, S, NH, N--C.sub.1 C.sub.10-alkyl, N-aryl, NSO.sub.2--C.sub.1 C.sub.10-alkyl, N--SO.sub.2-aryl, or N--SO.sub.2-heteroaryl; R.sub.1 to R.sub.8 each independently represents hydrogen atom or a substituent defined in the description; A is as defined in the description; n represents an integer from 0 to 4, inclusive; and pharmaceutically acceptable salts thereof. The compounds are the ligands of PPAR-gamma receptor and are useful as medicaments ##STR00001##

 
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