The keto nitrile shown is treated with an excess of lithium aluminium hydride in dry ether, followed by aqueous work-up. Which structure is the product?

4-Oxopentanenitrile has a ketone and a nitrile. Lithium aluminium hydride reduces the ketone to a secondary alcohol and the nitrile to a primary amine (CH2NH2), giving 5-aminopentan-2-ol. Sodium borohydride would reduce only the ketone, and the keto amine would retain a carbonyl.