ethadione ethadione ethadione is an anticonvulsant medication in the oxazolidinedione family used mainly to treat seizures. ethadioneclinical dataatc coden03ac03 (who) identifiers iupac name 3-ethyl-5,5-dimethyl-1,3-oxazolidine-2,4-dione cas number520-77-4 ypubchem cid10630chemspider10184 yuniii0f8o700bbkeggc17724 ychemblchembl93047 ycomptox dashboard (epa)dtxsid90199972 echa infocard100.007.544 chemical and physical dataformulac7h11no3molar mass157.169 g·mol−13d model (jsmol)interactive image smiles o=c1n(c(=o)oc1(c)c)cc inchi inchi=1s/c7h11no3/c1-4-8-5(9)7(2,3)11-6(8)10/h4h2,1-3h3 ykey:sigsnyaybsjatd-uhfffaoysa-n y (verify)