carbon nuclear magnetic resonance proton nuclear magnetic resonance 62 article 40 unclassified drug 36 mass spectrometry 34 nonhuman 32 chemical structure 20 drug isolation 18 Animals 16 chemistry 16 drug structure 16 controlled study 14 priority journal 14 Molecular Structure 12 conference paper 12 electrospray mass spectrometry 12 fast atom bombardment mass spectrometry 12 infrared spectroscopy 12 synthesis 12 Humans 10 Magnetic Resonance Spectroscopy 10 antifungal agent 10 molecular model 10 animal 8 antifungal activity 8 chemical reaction 8 drug synthesis 8 human 8 steroid 8 structure analysis 8