| http://www.w3.org/ns/prov#value | - A tryptoanthrinimine compound according to claim 1, represented by the formula (1): ##STR75## wherein R1, R2, R3, R4 and R5 are the same or different and indicate a hydrogen atom, an alkyl group, an aryl group, an aralkyl group, an alkoxy group, an alkyl halide group or a halogen atom; and n is an integer of 1 to 4.
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