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4-(Ethylsulfonyl)pyrazole-3-carboxamide Ethiprole is an impurity of Ethiprole (E678320), which is a phenylpyrazole based insecticide used in rice ecosystem on Trichogramma japonicum, and egg parasitoid of rice lepidopterans. 4-(Ethylsulfonyl)pyrazole-3-carboxamide Ethiprole can be used to regulate plant growth.