Patent ID: 8420810

Claim:
A compound of a formula (I): wherein R 1 represents (1) a C3-10 branched alkyl group which may be substituted or (2) a —(CH 2 ) m —NR 5 R 6 group, R 5 and R 6 each independently represent a C1-6 alkyl group which may be substituted, or R 5 represents a hydrogen atom and R 6 represents a C3-6 branched alkyl group which may be substituted, m represents 0 or an integer of 1 to 3; R 2 represents a hydrogen atom or a C1-4 alkyl group which may be substituted; R 3 represents a C1-4 alkyl group which may be substituted or a halogen atom; R 4 represents a C1-4 alkyl group which may be substituted or a C3-6 cycloalkyl group which may be substituted; and ring 1 represents a cyclic group which has planarity and may have a substituent group, a salt thereof, or an N-oxide thereof.