G 31442;Sulfinpyrazone sulfone;Sulfinpyrazone EP Impurity A;Sulfinpyrazone impurity A CRS;Sulfinpyrazone Impurity 1 (Sulfinpyrazone EP Impurity A);1,2-Diphenyl-4-[2-(phenylsulfonyl)ethyl]-3,5-pyrazolidinedione;1,2-diphenyl-4-[2-(phenylsulphonyl)ethyl]pyrazolidine-3,5-dione