THIS INVENTION PROVIDES NEW COMPOUNDS HAVING NPY Y5 ANTAGONISTIC ACTIVITY. THE PRESENT INVENTORS FOUND THAT A COMPOUND OF THE FORMULA (I): WHEREIN R1 IS SUBSTITUTED OR UNSUBSTITUTED ALKYL OR THE LIKE; P, Q AND R ARE EACH INDEPENDENTLY 0 OR 1; RING A IS OXADIAZOLE; AND R2 IS SUBSTITUTED OR UNSUBSTITUTED ALKYL OR THE LIKE, HAS NPY Y5 ANTAGONISTIC ACTIVITY.