5,5'-Diamino-3,3,3',3'-tetramethyl-2,2',3,3'-tetrahydro-1,1'-spirobi[indene]-6,6'-diol
5,5',6,6'-Tetrahydroxy-3,3,3',3'-tetramethyl-1,1'-spirobiindane
(R)-2,2',3,3'-Tetrahydro-1,1'-spirobi[indene]-7,7'-diol
3,3,3',3'-Tetramethyl-2,2',3,3'-tetrahydro-1,1'-spirobi[indene]-6,6'-diol
2,2',3,3'-Tetrahydro-1,1'-spirobi[indene]-7,7'-diol
(S)-2,2',3,3'-Tetrahydro-1,1'-spirobi[1H-indene]-7,7'-diol
