2,4-Diazaspiro(5.5)undecane-1,3,5-trione, 7-isobutyl- 4-24-00-02029 (Beilstein Handbook Reference) 67196-30-9 7-Isobutyl-2,4-diazaspiro(5.5)undecane-1,3,5-trione BRN 0242189