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24 European Crystallographic Meeting, ECM24, Marrakech, 2007 Page s201 Acta Cryst. (2007). A63, s201 Two enantiomeric molecules of (I) are linked by N-H...O hydrogen bonds. These N-H...O hydrogen bonds generate R2(12) rings, which also have two edge-fused S(5) rings, resulting in an S(5)[R2(12)]S(5) motif [1]. The structure (II) is stabilized by N-H...O, C-H...O and C-H...π interactions. The N-H...O hydrogen bonds generate two C(6) chains one within the other and these chains are linked by C-H...O hydrogen bonds generating and R2(21) ring motif. Two inversion-related molecules of (III) are linked by N-H...O hydrogen bonds generating an R2(12) ring motif. There are no direction specific aromatic π-π interactions between adjacent rings in of (III), but two CH...π interactions link parallel phthalide rings [2]. The phthalide part of the molecules are planar in all three compounds and the dihedral angles between the phthalide group and the benzene ring are 63.26 (8) ̊, 62.81(8) ̊ and 71.18 (5) ̊ for I, II and III, respectively.

First atomic structure of bacterial S-layer protein reveals a novel protein architecture