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| Description: Ring identification system (a) Carbon numbering system (b) used for steroids. Structural conventions (c), with cholestanol as the example. a-Substituents project below the plane of the steroid ring system (blue dashed wedge), and b-substituents project above that plane (red solid wedge). The hydrogens at positions 5, 9, and 14 have the a-configuration, whereas the hydroxyl, the two methyl groups, the hydrogen at C-8, and the aliphatic side chain at C-17 are all b-substituents. Picture Stats: Views: 111 Filesize: 36.38kB Height: 600 Width: 366 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=34672 |