article 6 asterias drug isolation 6 steroid 6 Animal 4 Magnetic Resonance Spectroscopy 4 Saponins 4 Starfish 4 Support, Non-U.S. Gov't 4 drug structure 4 unclassified drug 4 5alpha cholestane 3beta,5,6beta,15alpha,26 pentol 26 sulfate 2 Asterias 2 Asterias forbesii 2 Asteroidea 2 Carbohydrate Sequence 2 Female 2 Glycosides 2 Hydrolysis 2 Molecular Sequence Data 2 Oligosaccharides 2 Ophidiaster ophidianus 2 Ovary 2 Steroids 2 acanthaglycoside b 2 acanthaglycoside c 2 asterosaponin 2 carbon nuclear magnetic resonance 2 controlled study 2 drug conformation 2