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b - Carotene CH3 CH3 CH3 CH3 CH3 CH3 CH3 CH3 H3C CH3 H3C CH3 CH3 CH3 CH3 H3C CH3 CH3 CH3 CH3 CH2OH Oxidation C H O Retainal Retinol (Vitamin A) - 2Hb - Carotene CH3 CH3 CH3 CH3 CH3 CH3 CH3 CH3 H3C CH3 H3C CH3 CH3 CH3 CH3 H3C CH3 CH3 CH3 CH3 CH2OH Oxidation C H O Retainal Retinol (Vitamin A) - 2H