Fig 2. Chromatograms and mass spectra of alkaloid standards from Pilocarpus microphyllus analyzed by LC/MS.

Pilocarpine, showing the retention time at 15.05 min and molecular weight for mass spectrometry, electron spray [M + H]⁺ at 209 Da. (B) Epiisopiloturine, showing the retention time at 17.05 min and molecular weight for mass spectrometry, electron spray [M + H] ⁺ at 287 Da.