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The chemical structures of the main alkaloids identified in ABSP and ABSSP. The numbers of the chemical structures correspond with those listed in Table 1. (1) Betaine; (2) arecaidine; (3) cordycepin; (4) arecoline; (6) cephalotaxine; (9) ligustrazine; (10) N-feruloyltyramine; (12) berberine; (16) monocrotaline; (20) berberrubine; (26) trigonelline; (27) caffeine; (29) catharanthine.
