Structure of 1-[(benzyloxycarbonyl)amino]cyclopropane-1-carbohydroxamic acid

C12H14N2O4 (Z-AC3c-NHOH, Z = benzyloxycarbonyl, AC3C = 1-amino-1-cyclopropanecarboxylic acid, NHOH = hydroxamic acid), M(r) = 250.25, monoclinic, P2(1)/n, a = 25.010 (2), b = 6.144 (1), c = 8.169 (1) angstrom, beta = 93.30 (2)-degrees, V = 1253.2 (3) angstrom3 Z = 4, D(m) = 1.32, D(x) = 1.326 g cm-3, lambda(Mo K-alpha) = 0.71069 angstrom, mu = 0.943 cm-1, F(000) = 528.0, T = 298 K, final R value for 1807 [I greater-than-or-equal-to 2.5-sigma(I)] reflections is 0.053. The conformation of the urethane -CONH- bond is unusual (cis). The Ac3c amino-acid residue is folded and the set of backbone torsion angles falls in the uncommon B ('bridge') region of the energy map. The conformation of the R-C(=O)-NHOH moiety is synperiplanar.