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a) Representative PPAP natural products biosynthetically derived from a common carbocation; b) Previous work revealed that formic acid uniquely promoted biomimetic C3-cyclization to the clusianone core, and excited-state intramolecular proton transfer resulted in a biomimetic C1-cyclization to the nemorosone core; c) Biomimetic cyclizations lead to a small library of diverse SASs which were evaluated by MAP for biological activities.
