Isoprene

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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.

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