Provision of a compound represented by formula (1). Wherein X is an acid that forms a salt with the guanidine moiety, and R 1 and R 2 are each independently an alkyl group having 1 to 18 carbon atoms, a cycloalkyl group, an aryl group, an alkylaryl group, an alkenyl group ( These groups are any selected from the group consisting of a hydrogen atom and a group having one or more substituents containing a sulfur atom, a nitrogen atom, and an oxygen atom).
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