Patent ID: 8642281

Claim:
A compound represented by general formula (I) below: wherein R 3 is selected from the group consisting of a hydrogen atom, a bromine atom, wherein each of R 6 , R 7 and R 8 independently represents a hydrogen atom, a substituted or unsubstituted alkyl having 1 to 6 carbon atoms, a substituted or unsubstituted aryl, or a substituted or unsubstituted heteroaryl; and R 6 and R 8 may be combined together to form a substituted or unsubstituted aryl or substituted or unsubstituted heteroaryl with the carbon atom bound to each of R 6 and R 8 , wherein the substituted or unsubstituted aryl formed by combining R 6 and R 8 together with the carbon atom bound to each R 6 and R 8 is selected from the group consisting of a naphthyl, an aminophenyl, and a nitrophenyl.