12 is a hydrogen atom or a methyl group.) (Wherein each of RMB13 and RMB14 which are independent of each other, is a hydrogen atom, a methyl group or a methoxy group.) (Each of ArMB1 and ArMB2 which are independent of each other, is a phenyl group which may be substituted, or a naphthyl group which may be substituted.) ArMC1???N???N???YMC???YMC2???(NRMC1???YMC2)C MC ???YMC???N???N???ArMC2???(MC) (