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Linkage patterns of necic acids with necine bases. (A) Senecionine type. (B) Triangularine type. (C) Lycopsamine type. (D) Monocrotaline type. (E) Phalaenopsine/ipanguline type. (F) Compounds combining necic acids of triangularine and lycopsamine types. (G) Simple PAs. (H) PAs with unusual linkage patterns.
