This invention provides a compound of the formula (I): a pharmaceutically acceptable salt or solvate thereof, wherein R1 is substituted or unsubstituted alkyl or the like, R2 is hydrogen or substituted or unsubstituted alkyl, Ring A is monocyclic or bicyclic aromatic heterocycle, R3 is substituted or unsubstituted aryl, substituted or unsubstituted heteroaryl or substituted or unsubstituted heterocycle, R4 is halogen, cyano, substituted or unsubstituted alkyl, substituted or unsubstituted cycloalkyl or the like, m is an integer between 0 and 2, n is an integer between 0 and 5, R is halogen, oxo, cyano, nitro, substituted or unsubstituted alkyl or the like, and p is an integer between 0 and 2 as novel compounds having NPY Y5 antagonistic activity.