title: Marine sterols. V. Isolation and structure of occelasterol, a new 27-norergostane-type sterol, from an annelida, Pseudopotamilla occelata.
mesh_terms: D000085:Acetates; D000818:Animals; D000845:Annelida / Q000032:analysis*; D002845:Chromatography; D002855:Chromatography, Thin Layer; D003897:Desmosterol; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D008968:Molecular Conformation; D009904:Optical Rotation; D012822:Silicon Dioxide; D013053:Spectrophotometry; D013055:Spectrophotometry, Infrared; D013261:Sterols / Q000032:analysis / Q000302:isolation & purification; D013329:Structure-Activity Relationship
chemical_list: D000085:Acetates; D013261:Sterols; D003897:Desmosterol; D012822:Silicon Dioxide