A compound represented by the following general formula (1), or a salt or hydrate thereof:
wherein R
1
represents a C1-C6 alkyl group or C2-C6 alkynyl group which may be substituted, or a phenyl group which may be substituted, R
2
represents a hydrogen atom or a C1-C6 alkyl group, R
3
represents methyl or ethyl group, R
4
represents a C1-C6 alkyl group, R
5
represents a hydrogen atom, provided that a compound wherein R
1
is a C1-C6 alkyl group unsubstituted or substituted with a halogen atom and R
2
is a hydrogen atom is excluded.
A compound represented by the following general formula (1), or a salt or hydrate thereof: wherein R1 represents a C1-C6 alkyl group or C2-C6 alkynyl group which may be substituted, or a phenyl group which may be substituted, R2 represents a hydrogen atom or a C1-C6 alkyl group, R3 represents methyl or ethyl group, R4 represents a C1-C6 alkyl group, R5 represents a hydrogen atom, provided that a compound wherein R1 is a C1-C6 alkyl group unsubstituted or substituted with a halogen atom and R2 is a hydrogen atom is excluded.