1,6'-bi-1H-indene, 2,3-dihydro- 2,3-dihydro-1H,3'H-1,5'-biindene InChI=1/C18H16/c1-2-7-17-14(4-1)10-11-18(17)16-9-8-13-5-3-6-15(13)12-16/h1-5,7-9,12,18H,6,10-11H