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![(11bR,11′bR)-4,4′-(9,9-Dimethyl-9H-xanthene-4,5-diyl)bis-dinaphtho[2,1-d:1′, 2′-f][1,3,2]dioxaphosphepin](https://api.sigmaaldrich.com/deepweb/assets/sigmaaldrich/product/structures/198/331/bd88130d-f49e-4bc8-b82e-5e43b3bcea95/640/bd88130d-f49e-4bc8-b82e-5e43b3bcea95.png)