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The title compound, C 24 H 42 N 2 O 7 , is a chiral lactam-constrained amino acid with a six-membered ring backbone and isopropyl and  tert -butyl ester side chains. The conformation of the six-membered ring can be described as a half chair, with two CH 2  C atoms lying 0.443 (1) and −0.310 (1) Å out of the best plane of the other four atoms (mean deviation = 0.042 Å). Both N atoms are  sp2  hybridized, lying 0.0413 (9) and 0.067 (1) Å out of the planes defined by the three C atoms bonded to them. The absolute configuration was determined, based on resonant scattering of light atoms in Cu  K α radiation.

tert-Butyl (2S)-2-{3-[(R)-bis(tert-butoxycarbonyl)amino]-2-oxopiperidin-1-yl}-3-methylbutanoate