L-Asparaginyl-L-valine 1.33-hydrate

The title compound, C₉H₁₇N₃O₄·1.33H₂O, crystallizes with three peptide mol­ecules and four water mol­ecules in the asymmetric unit. Two of the peptide mol­ecules contain an intramolecular hydrogen bond between the N-terminal amino group and the asparagine side chain. Valine side chains aggregate into large hydro­phobic columns.

Disodium cytidine-5'-monophosphate 6.07-hydrate methanol 0.27-solvate

The crystal structure of the title complex, Na₂⁺·C₉H₁₂N₃O₈P^-·6.07H₂O·0.27CH₄O, in space group P2₁2₁2₁ is remarkably similar to the monoclinic P2₁ structure of sodium cytidine-5'-monophosphate 6.5 hydrate [Borodi et al. (2001). Acta Cryst. E57, m514-m516].

α-Thymidine at 105 K

Two independent molecules in the crystal structure of the title nucleoside, 1-(2-de­oxy-α-D-ribofuranos­yl)-5-methyl­uracil, C₁₀H₁₄N₂O₅, form a dimer connected by two inter-base hydrogen bonds. The ring puckering modes are envelope C4′-endo and half-chair C3′-exo-C4′-endo, respectively, which are quite uncommon conformations for 2′-deoxy­riboses.

L-Threon­yl-L-alanine

In the title compound, C₇H₁₄N₂O₄, peptide mol­ecules are connected into β-sheet-like ribbons along the short tetra­gonal axis [4.7065 (4) Å] by one N—H...O and two C^α;—H...O inter­actions.

2-(L-Alanylamino)-L-butyric acid

The title dipeptide, C₇H₁₄N₂O₃, with the common name L-alanyl-L-2-amino­butyric acid, has previously been crystallized as the 0.33-hydrate [Görbitz (2002). Acta Cryst. C58, o533-o536]. By using 1,1,1,3,3,3-hexa­fluoro­propan-2-ol as the solvent, water-free crystals were obtained. The two crystal structures are related (P2₁, Z' = 3 for both), but the mol­ecular conformations and details of the hydrogen-bonding network are different.