1,1',3,3',5,5',6,6',7,7',8,8'-dodecahydro-2,2'-spirobi[cyclopenta[b]naphthalene] 2,2'-spirobi[2H-benz[f]indene], 1,1',3,3',5,5',6,6',7,7',8,8'-dodecahydro- InChI=1/C25H28/c1-2-6-18-10-22-14-25(13-21(22)9-17(18)5-1)15-23-11-19-7-3-4-8-20(19)12-24(23)16-25/h9-12H,1-8,13-16H