(''S'')-Cheilanthifoline is a benzylisoquinoline alkaloid (BIA) which has been isolated from '' Corydalis dubia'' and '' Argemone mexicana''. (''S'')-Cheilanthifoline is metabolically derived from (''S'')- reticuline, a pivotal intermediate in the biosynthesis of numerous BIAs. (''S'')-Cheilanthifoline is the immediate precursor of the BIA (''S'')-stylopine ( (''S'')-stylopine synthase/CYP719A20), which is the precursor for the alkaloids protopine and sanguinarine.

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