Patent ID: 8318746

Claim:
A compound represented by the formula (I) wherein R 1 is a 5- or 6-membered nitrogen-containing heterocyclic group represented by the formula which is optionally substituted; R 2 is an optionally substituted alkyl group, an optionally substituted 4- to 7-membered cyclic group, —OR 6 wherein R 6 is an optionally substituted alkyl group or an optionally substituted 4- to 7-membered cyclic group, or an optionally substituted amino group; R 3 is a hydrogen atom or an optionally substituted alkyl group, or R 2 and R 3 in combination (i) optionally form, together with the carbon atom they are bonded to, cyclopropane substituted by an optionally substituted 4- to 7-membered cyclic group, or (ii) optionally form ═N—OR 7 or ═CH—R 7 wherein R 7 is an optionally substituted alkyl group or an optionally substituted 4- to 7-membered cyclic group; Cy is an optionally substituted 6-membered cyclic group, which is optionally condensed with an optionally substituted 5- or 6-membered ring; and X 1 and X 2 are both optionally substituted carbon atoms, provided that when Cy is a benzene ring, then R 2 should not be pyrrolyl; or a salt thereof.