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Probe electrospray ionization (PESI) is a recently developed ionization technique based on electrospray ionization (ESI) that generates electrospray from the tip of a solid needle. High tolerance to salts, requirements of a trace amount of sample and direct ambient sampling- are major advantages of PESI compared with conventional ESI. In this report, three… (More)
A new benzocycloheptanone derivative, named gymnothedelignan C, and 14 known compounds were isolated from the Chinese endemic genus plant Gymnotheca chinensis Decne. The structure of the new compound was established by 1D and 2D NMR experiments.