The Crystal Structure of p-nitrophenyl-$\beta $-D-N-acetylglucosaminide Monohydrate

p-Nitrophenyl-B-D-N-acetylgluicosaminide monohydrate, C14H20O9N2, crystallizes in the orthorhombic system with a = 8.07, b = 41.66, c = 5.06 Å .§ The space group is P212121 with four molecules in the unit cell. A computer application of the tangent formula of Karle & Hauptman was used to solve the structure and least-squares refinement with anisotropic thermal parameters for the non-hydrogen atoms, has given an R index of 0.061 for the 1368 non-zero diffractometer data. All hydrogen atoms were located from a difference map. Standard deviations of non-hydrogen distances and angles average 0.009 Å and 0.6°, respectively. The glucopyranose ring is in the chair form and its structure is close to that found in other sugars. The packing of the molecules is determined by a complete scheme of hydrogen bonding.