Select the carbon atoms of the steroid nucleus in the molecule of cholesterol shown. Note that the hydrogen atoms have been omitted for clarity. Identify the appropriate group of atoms by selecting each atom individually on the canvas and assigning them a map number of 1 until all atoms are mapped. To do this, right-click on an atom and choose Atom Properties. (Mac users: Use an equivalent for right-clicking.) Then, clear the check mark to enable the Map field before entering a value.

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