The present invention provides a novel modulator of the TRPV1-receptor function, comprising a compound of the formula; wherein ring A is an optionally substituted carbocycle or heterocycle, ring B is an optionally substituted benzene ring or an optionally substituted 6-membered heteroaromatic ring containing N atom, a dashed line means existence or absence of a bond, n is 1 or 2, R1 and R2 are hydrogen etc., R3 is lower alkyl, R4 is lower alkyl or aryloxy, or R3 and R4 taken together may form optionally substituted 5- or 6-membered non-aromatic heterocycle.