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(a) The suffix '-oic acid' denotes the presence of a carboxy group attached to the parent hydride 'pentane' (see R-5.7.1), giving the structure and numbering shown as (I), below. Note that the carbon atom of the carboxy group is included in the parent chain and that the numbering of the chain, although shown, is not that used to indicate substituents of the chain in the name of the complete compound. The structure and numbering of the heterocyclic component, quinoline, is given as (II).
(I)
(II)
The locant '2' is the position on the heterocyclic component, quinoline, at which the acyclic component, pentanoic acid, is attached. No locant is given to denote the position of the acyclic component attached to the heterocycle, because, by definition, the acyclic component must be attached at the atom furthest from the principal group (see R-1.2.4.1). The structure and numbering of the conjunctive parent structure, quinoline-2-pentanoic acid is shown as (III).
(III)
(IV)
(c) Attaching structure (IV) and the methyl group to the conjunctive parent structure (III) completes the structure of the compound shown below.
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