tert-Butoxy­carbonyl-L-leucyl-L-alanine trichloro­ethyl ester (Boc-L-Leu-L-Ala-OTce)

The title compound, C₁₆H₂₇Cl₃N₂O₅, which is an enantiopure dipeptide trichloro­ethyl ester, adopts an extended conformation. The mol­ecules are linked via –NH...O=C hydrogen bonds into a unique β-spiral assembly along the c axis.

O-Benzyl-N-tert-butoxy­carbonyl-L-threonyl-L-proline trichloro­ethyl ester [Boc-L-Thr(Bzl)-L-Pro-OTce]

The title peptide compound, C₂₃H₃₁Cl₃N₂O₆, is a synthetic inter­mediate as a plasmodium falciparum blood-stage antigen. There is an intra­molecular N—H...O hydrogen bond between the urethane and benzyl ether groups. The relatively low melting point is attributed to the lack of an inter­molecular hydrogen-bond network.