16232-73-8 5-24-09-00217 (Beilstein Handbook Reference) 6,8-Diazaspiro(3.5)nonane-5,9-dione, 7-thioxo- 7-Thioxo-6,8-diazaspiro(3.5)nonane-5,9-dione BRN 0161427 Spiro(cyclobutane-2-thiobarbituric) acid