Carotenoids and their fatty acid esters in the petals of Adonis aestivalis.

Carotenoids and their fatty acid esters were investigated in the petals of Adonis aestivalis by UV-VIS, (1)H-NMR, FAB-MS, and CD spectrometry. (3S,3'S)-astaxanthin (diester: 72.2%, monoester: 13.