The present invention provides a GPR receptor function regulator comprising the compound represented by the formula: ##STR00001## [wherein ring A is an optionally substituted isocyclic or heterocyclic ring, P is a bond or spacer, ring D is an optionally substituted monocyclic aromatic ring which may be condensed with a 5- to 7-membered ring, V is a bond or the group represented by the formula --CR.sup.14.dbd.CR.sup.15-- or --N.dbd.CR.sup.16-- (wherein R.sup.14, R.sup.15 and R.sup.16 each represents a hydrogen atom or optionally substituted hydrocarbon group), Q is a bond or spacer, and W is a carboxyl or a group biologically equivalent to a carboxyl] or its salt or a prodrug thereof.