5,5-dimethyl-2-[(phenylcarbamothioyl)amino]-4,7-dihydro-5H-thieno[2,3-c]pyran-3-carboxylic acid

5,5-dimethyl-2-[(phenylcarbamothioyl)amino]-4,7-dihydro-5H-thieno[2,3-c]pyran-3-carboxylic acid