for the following products
(9,9-Dimethyl-(9H)-xanthene-4,5-diyl)-bis-diphenylphosphine | (9,9-Dimethyl-9H-xanthene-4,5-diyl)bis[diphenyl phosphine] | 9,9-Dimethyl-4,5-bis-(diphenylphosphino)xanthene | Xantphos | [5-(Diphenylphosphanyl)-9,9-dimethyl-9H-xanthen-4-yl]diphenylphosphane and 4,5-bis-(Diphenylphosphino)-9,9-dimethylxanthene
