Patent ID: 7524876

Claim:
A compound represented by the following general formula (I) or a salt thereof: [wherein R 1 and R 2 independently represent hydrogen atom, a C 1-6 alkyl group which may be substituted, or a group represented by the following formula (A): [wherein X 1 and X 2 independently represent hydrogen atom, or a group represented as —N(R 3 )(R 4 ) (wherein R 3 and R 4 independently represent hydrogen atom, a C 1-6 alkyl group which may be substituted, a C 1-6 alkylcarbonyl group which may be substituted, or a C 1-6 alkyloxycarbonyl group which may be substituted); and n represents an integer of 1 to 6], provided that R 1 and R 2 do not simultaneously represent hydrogen atom].