1, 2, 5-thiadiazole compound containing a solvent and the solvent is an organic compound using ext

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The object of the present invention is to provide a solvent which is free from the risk of destroying the ozone layer surrounding the Earth, hardly toxic, and free from the risk of causing environment pollution problems by polluting underground water or air. The solvent contains at least one chosen from 1, 2, 5-thiadiazole compounds represented by formula (1) below : (where R1 and R2 each represent hydrogen or methyl group).