article 32 beta carboline 28 unclassified drug 20 Carbolines 18 beta carboline derivative 18 harmine 18 priority journal 16 mass spectrometry 14 Harmine 12 Molecular Structure 12 chemical structure 12 chemistry 12 harman 12 nonhuman 12 photochemistry 12 Hydrogen-Ion Concentration 10 Ultraviolet Rays 10 animal cell 10 carboline derivative 10 controlled study 10 matrix assisted laser desorption ionization time of flight mass spectrometry 10 ultraviolet spectroscopy 10 Photochemistry 8 Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization 8 Spectrophotometry, Ultraviolet 8 pH 8 ultraviolet radiation 8 Animals 6 Cattle 6 DNA 6