In the formula (14) above, R1 and R2 are the same as those of the formula (13); and R3 is an alkyl group, --NR1 R2 group (R1 and R2 are an alkyl group or an aryl group), --COR1 group (R1 is an alkyl group or an aryl group), an aryl group, --NR1 R2 group (R1 and R2 is an alkyl group or an aryl group), and --NCR1 R2 group (R1 and R2 are an alkyl group or an aryl group).