“…The X-ray structure of 4,4-diphenyl-1,2,5-thiadiazolidine-3-one 1,1-dioxide 498 has been determined as part of a wider study of 1,2,5-thiadiazolidine-3-one 1,1-dioxide chemistry which is of interest because of their potential anticonvulsant activity . Structures of compounds 499 and the alicyclic sulfamide Me(NO 2 )NSO 2 N(NO 2 )Et have been published by a Zelinsky Institute group …”