(R)-3,3,6-trimethyl-4,5,6,7-tetrahydro-3H-spiro[benzofuran-2,9'-fluorene]

(5'R)-1',1',3a',5'-tetramethyl-1',3',3a',4',5',6',7',7a'-octahydrospiro[fluorene-9,2'-indene]

spiro[9H-fluorene-9,3'(10'bH)-fluoreno[9,1-cd][1,2]dithiin]

9,9-bis(9H-fluoren-9-yl)fluorene

3',3',5'-trimethyl-4',5'-dihydro-3'H-spiro[fluorene-9,2'-furan]-5'-ol