Spiro[xanthen-9',2-(3,6-dihydro-4,5-dimethyl-2H-thiopyran)]

di-xanthen-9-yl sulfide

苯

dispiro[thioxanthene-9,2'-thiirane-3',9''-xanthene]

9-(9'H-fluoren-9'-ylidene)-9H-xanthene