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A compound, which is represented by the following formula (1) or (2):

• in the formula (1) and the formula (2),
• R1 and R2 each independently represent an unsubstituted alkyl group having 1 to 8 carbon atoms,
• R3 and R4 each independently represent
• a hydrogen atom,
• an unsubstituted alkyl group or substituted alkyl group having 1 to 8 carbon atoms,
• an unsubstituted alkenyl group or substituted alkenyl group having 2 to 8 carbon atoms,
• an unsubstituted aralkyl group or substituted aralkyl group having 7 to 12 carbon atoms, or
• an unsubstituted aryl group or substituted aryl group having 6 to 12 carbon atoms, or
• R3 and R4 are bonded to each other to form a nitrogen-containing heterocycle,
• R5 and R6 each independently represent
• a hydrogen atom,
• an unsubstituted alkyl group or substituted alkyl group having 1 to 8 carbon atoms,
• an unsubstituted alkenyl group or substituted alkenyl group having 2 to 8 carbon atoms,
• an unsubstituted aralkyl group or substituted aralkyl group having 7 to 12 carbon atoms, or
• an unsubstituted aryl group or substituted aryl group having 6 to 12 carbon atoms, or
• R5 and R6 are bonded to each other to form a nitrogen-containing heterocycle,
• a substituent in the substituted alkyl group represented by any one of R3 to R6 is a cyano group or an alkoxy group, provided that a number of carbon atoms of the substituent is excluded from the number of carbon atoms specified above,
• a substituent in each of the substituted alkenyl group, the substituted aralkyl group, and the substituted aryl group each represented by any one of R3 to R6 is a functional group selected from the group consisting of an alkyl group, a cyano group, and an alkoxy group, provided that a number of carbon atoms of the substituent is excluded from the number of carbon atoms specified above, and
• X− represents an anion.