The nitrile group outranks the amine when selecting the principal characteristic group, fixing C-1 at the nitrile carbon. Numbering from there: C-1 (≡N), C-2 (CH2), C-3 (CH–NH2), C-4 (CH3) gives a four-carbon chain named as a nitrile with the amino group at C-3: 3-aminobutanenitrile.
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