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(A) Structure of (±) Gossypol, Apogossypol, BI79D10, 8r, and BI97C1. (B) Structure of 5, 5′ substituted Apogossypolone derivatives, Apogossypolone (ApoG2), BI97D6, and BI97E4. (C) Preparation of pure (−) and (+) BI97D6 and ApoG2 atropisomers using a normal phase liquid chiral column chromatography.
