Synthesis of optically active natural carotenoids and structurally related compounds. X. Synthesis of (3R,3'S,5'R)-capsanthin, 3S,5R,3'S,5'R)-capsorubin, (3'S,5'R)-cryptocapsin, and some related compounds. A new approach to optically active, five-membered-ring carotenoid building units by hydroboration

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