(3S)-7-[3,5-bis(trifluoromethyl)phenyl]-4-[(3R)-4-[3,5-bis(trifluoromethyl)phenyl]-3-tert-butyl-2,3-dihydro-1,3-benzoxaphosphol-7-yl]-3-tert-butyl-2,3-dihydro-1,3-benzoxaphosphole
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