1-BUTANONE, 4-(3-AZASPIRO(5.5)UNDEC-3-YL)-1-(2-THIENYL)- 1228-27-9 4-(3-Azaspiro(5.5)undec-3-yl)-1-(2-thienyl)-1-butanone 5-20-04-00423 (Beilstein Handbook Reference) BRN 1347957