title: Minor sterols of marine invertebrates 37. Isolation of novel coprostanols and 4 alpha-methyl sterols from the tunicate Ascidia nigra.
mesh_terms: D000818:Animals; D004083:Cholestanol / Q000302:isolation & purification*; D002784:Cholesterol / Q000031:analogs & derivatives*; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D007536:Isomerism; D013261:Sterols / Q000302:isolation & purification*; D013329:Structure-Activity Relationship; D014561:Urochordata / Q000032:analysis*
chemical_list: D013261:Sterols; D004083:Cholestanol; D002784:Cholesterol