Multi-layer context tree modeling for lossless compression of gray-scale images

A 1,4-bis(2',2'-diphenylvinyl)benzene derivative represented by formula (I): (I) wherein R1 and R2 each represents a different lower alkyl group and Me represents a methyl group, a charge transporting material containing the compound (I), and an electrophotographic photoreceptor comprising a charge transporting layer containing the charge transporting material are disclosed.