article 7 chemistry Magnetic Resonance Spectroscopy 4 nuclear magnetic resonance spectroscopy 4 Glycosides 3 Molecular Structure 3 Support, Non-U.S. Gov't 3 biosynthesis 3 chemical structure 3 glycoside 3 Antibiotics 2 Biosynthesis 2 Bufanolides 2 Chemistry 2 Chemistry, Pharmaceutical 2 Hexoses 2 Hydrazones 2 Pregnanes 2 StereoisomerismPB - Birkhäuser-Verlag 2 antibiotic agent 2 bufadienolide derivative 2 hexose 2 hydrazone derivative 2 mass spectrometry 2 metabolism 2 pregnane derivative 2 stereoisomerism 2 22,23 dihydroxy 3alpha fluorostigmastan 6 one 1 22,23 dihydroxy 3beta fluorostigmastan 6 one 1 24 ethylbrassinosteroid derivative 1