Here the choice lies between two possible main chains of equal length, each containing six side chains in the same positions. Listing in increasing order, the number of carbon atoms in the several
side chains of the first choice as shown and of the alternate second choice result as follows:
The expression, "the greatest number of carbon atoms in the smaller side chains", is taken to mean the largest side chain at the first point of difference when the size of the side chains is examined
step by step. Thus, the selection in this case is made at the fourth step where 2 is greater than 1.
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