TECHNOLOGY FOCUS - ELECTRONICS - Preferred Composition: The electrophotographic photoreceptor has photoreceptor layer containing binder resin and charge transport agent, provided on electroconductive base.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (disclosed): Benzidine and halogenated stilbene, are coupling-reacted. The obtained still benzidine derivative and halogenated aryl derivative are coupling-reacted, to obtain styryl benzidine derivative of formula (I). SPECIFIC COMPOUNDS - Seven specific styryl benzidine derivatives, such as Nasterisk4asterisk,Nasterisk4'asterisk-bis-(4-((1E,3E)-4-phenyl-buta-1,3-dienyl)-phenyl)-Nasterisk4asterisk,Nasterisk4'asterisk-bis-(4-((E)-styryl)-phenyl)-biphenyl-4,4'-diamine of formula (HT-1), Nasterisk4asterisk,Nasterisk4'asterisk-bis-(4-((1E,3E)-4-phenyl-buta-1,3-dienyl)-phenyl)-Nasterisk4asterisk,Nasterisk4'asterisk-bis-(4-((E)-2-p-tolyl-vinyl)-phenyl)-biphenyl-4,4'-diamine, 3,3'-dimethyl-Nasterisk4asterisk,Nasterisk4'asterisk-bis-(4-((1E,3E)-4-phenyl-buta-1,3-dienyl)-phenyl)-Nasterisk4asterisk,Nasterisk4'asterisk-bis-(4-((E)-styryl)-phenyl)-biphenyl-4,4'-diamine, 3,3'-dimethyl-Nasterisk4asterisk,Nasterisk4'asterisk-bis-(4-((1E,3E)-4-phenyl-buta-1,3-dienyl)-phenyl)-Nasterisk4asterisk,Nasterisk4'asterisk-bis-(4-((E)-2-p-tolyl-vinyl)-phenyl)-biphenyl-4,4'-diamine and Nasterisk4asterisk,Nasterisk4'asterisk-bis-(4-((1E,3E)-4-(4-phenoxy-phenyl)-buta-1,3-dienyl)-phenyl)-Nasterisk4asterisk,Nasterisk4'asterisk-bis-(4-((E)-styryl)-phenyl)-biphenyl-4,4'-diamine, are disclosed.    EXAMPLE - 1-Chloro-4-((E)-styryl)-benzene (in g) (16.2), 2-(di-cyclohexyl phosphino) biphenyl (0.066), tris di-benzylideneacetone dipalladium (0.086), t-sodium butoxide (7.68), benzidine (6.8) and orthoxylene (500 ml), were stirred at 120degreesC for 5 hours. The resulting solution was cooled to room temperature. The resulting organic layer was washed 3 times with water and dried with anhydrous sodium sulfate and activated clay, and xylene was depressurizingly distilled. The obtained residue was purified, to obtain Nasterisk4asterisk,Nasterisk4'asterisk-bis-(4-((E)-styryl)-phenyl)-biphenyl-4,4'-diamine. 1-Chloro-4-((1E,3E)-4-phenyl-buta-1,3-dienyl)-benzene (8.66), 2-(di-cyclohexyl phosphino) biphenyl (0.016), tris di-benzylideneacetone dipalladium (0.021), t-sodium butoxide (2.88), the obtained Nasterisk4asterisk,Nasterisk4'asterisk-bis-(4-((E)-styryl)-phenyl)-biphenyl-4,4'-diamine (9.7) and orthoxylene (200 ml), were stirred at 120degreesC for 3 hours under argon atmosphere. The resulting organic layer was washed 3 times with water and dried with anhydrous sodium sulfate and activated clay, and xylene was depressurizingly distilled. The obtained residue was purified, to obtain yellow crystals of Nasterisk4asterisk,Nasterisk4'asterisk-bis-(4-((1E,3E)-4-phenyl-buta-1,3-dienyl)-phenyl)-Nasterisk4asterisk,Nasterisk4'asterisk-bis-(4-((E)-styryl)-phenyl)-biphenyl-4,4'-diamine of formula (HT-1). The obtained styryl benzidine derivative had excellent compatibility with binder resin, and high sensitivity for a long period of time.