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The intermediate of d-biotin, (3aS,6aR)-1,3-dibenzyltetrahydro-1H-thieno[3,4-d]-imidazole-2(3H)-one-4-ylidenepentanoil acid was synthesized from (3aS,6aR)-1,3-dibenzyltetrahyro4H-thieno[3,4-d]-imidazole-2,4(1H)-dione by using the Grignard reaction. The st