Patent ID: 8445529

Claim:
A compound represented by the following formula (1) or a salt thereof: , wherein R 1 represents a hydrogen atom, a lower alkyl group which may have a substituent, a hydroxy group, or a lower alkoxy group which may have a substituent; R 2 represents a hydrogen atom, a lower alkyl group which may have a substituent, a lower cycloalkyl group which may have a substituent, an aryl group which may have a substituent, or a heterocyclic group which may have a substituent; R 3 represents a halogen atom, a lower alkyl group which may have a substituent, a lower alkenyl group which may have a substituent, a lower alkynyl group which may have a substituent, a lower cycloalkyl group which may have a substituent, an aryl group which may have a substituent, a heterocyclic group which may have a substituent, a lower alkoxy group which may have a substituent, a lower alkenyloxy group which may have a substituent, a lower alkynyloxy group which may have a substituent, a lower cycloalkyloxy group which may have a substituent, an aryloxy group which may have a substituent, or a heterocyclic oxy group which may have a substituent; m represents 0, 1, 2, or 3, provided that R 3 may be the same or different when m is 2, or 3.