FIELD: chemistry.
SUBSTANCE: disclosed is an electrophotographic photosensitive element, wherein the underlayer is a layer in which at least one compound selected from a group consisting of a compound of formula 
(1), a compound of formula 
(2), a compound of formula 
(3) and a compound of formula 
(4) can be detected by gas chromatographic analysis when the underlayer is heated to 150°C for 60 minutes using a vapour phase method.
EFFECT: obtaining an electrophotographic photosensitive element.
15 cl, 1 dwg, 2 tbl, 109 ex
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