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A water wire in L‐prolyl‐L‐serine monohydrate

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Despite the extra functional group in the serine side chain, the crystal packing arrangement of the title compound {systematic name: (S)‐3‐hydroxy‐2‐[(S)‐pyrrolidine‐2‐carboxamido]propanoic acid monohydrate}, C8H14N2O4·H2O, is essentially the same as observed for a series of L‐Pro‐L‐Nop peptide hydrates, where Nop is a strictly nonpolar residue. This is rendered possible by a monoclinic P21 packing arrangement with Z′ = 2 that deviates from orthorhombic P212121 symmetry only for the seryl hydroxy groups, which form infinite O—H...O—H hydrogen‐bonded chains along the 5.3 Åa axis. At the same time, cocrystallized water molecules form parallel water wires.
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Document Type: Research Article

Affiliations: Department of Chemistry, University of Oslo, PO Box 1033 Blindern, N-0315 Oslo, Norway

Publication date: May 15, 2013

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