Compounds with biological roles [BR:br08001] Steroids 27-Carbon atoms Cholestane derivatives [Fig] C01164 7-Dehydrocholesterol Lipids [BR:br08002] ST Sterol lipids ST01 Sterols ST0101 Cholesterol and derivatives C01164 7-Dehydrocholesterol ST03 Secosteroids ST0302 Vitamin D3 and derivatives C01164 Provitamin D3