2,4-Diazaspiro(5.5)undec-8-ene-1,3,5-trione, 3-thioxo-8,9,11-trimethyl- 3-Thio-8,9,11-trimethyl-2,4-diazaspiro(5.5)undec-8-ene-1,3,5-trione 4-24-00-02054 (Beilstein Handbook Reference) 67196-44-5 BRN 0224073