Rule C-32 32.1 - The prefix "hydro-", to denote added hydrogen atoms, is the only case where addition is expressed by a prefix; its use is
described in Rules A-23.1, B-1.1, B-1.2 and C-16, but is extended also to trivial names.
In spite of precedent it is better, even when devising trivial names for a series of naturally occurring or other related products, to choose as parent either the fully saturated compound or one with
the maximum number of non-cumulative double bonds, so that "ene" syllables or "hydro" prefixes can be used with their normal connotation.
Examples to Rule C-32.1
See Recommendations'93 R-1.2.3
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