p. 3595 - 3602
(2007/10/02)10-(9H-thioxanthene-9-ylidene)-9(10H)-anthracenone
3,3-diphenyl-spiro[thiirane-2,9'-thioxanthene]
3,3'-diphenyl spiro-(thiaxanthene-10,2'-thiiran)
dispiro[thioxanthene-9,2'-thiirane-3',9''-xanthene]
dispiro[thioxanthene-9,2'-thiirane-3',9''-thioxanthene]