4-tert-Butyloxycarbonyl-6(S)-(hydroxymethyl)-3(S)-(1-methylethyl)piperazin-2-one

The six-membered ring of the title ester [IUPAC name: tert-butyl 5-(hydroxymethyl)-2-(1-methylethyl)-3-oxopiperazine-1-carboxylate], C₁₃H₂₄N₂O₄, adopts a distorted half-chair configuration with C5 lying out of plane. Hydrogen bonds are formed between the OH group and the protecting carbonyl group, and between NH and the piperazine oxo group.

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