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Representative HPLC chromatograms for: (A) Alkaloid standards lycorine (LYC), galanthamine (GAL), narciclasine (NAR) and papaverine (PAP); (B) heterocyclic compounds extracted from the Narcissus papyraceus stage 1 bulb and (C) heterocyclic compounds extracted from the Narcissus papyraceus stage 5 leaves.
