Experimental Crystal data

R factor = 0.060; wR factor = 0.166; data-to-parameter ratio = 13.1. The molecular structure of the title compound, C12H19NO5, may be visualized as made up of two nearly perpendicular planes [dihedral angle = 87.39 (12)] and its crystal structure is a good example of C—H O interactions assuming signifi-cance in optimizing supramolecular aggregation in crystals in a molecule which is severely imbalanced in terms of donors to acceptor atoms. The pyrrolidine ring adopts a (3T2) twist conformation with puckering parameters Q = 0.2630 (4) Å and ’ = 59 (9). The crystal structure features R2 4(10) and R3 4(26) ring motifs formed by four weak C—H O inter-actions, leading to supramolecular sheets lying parallel to the bc plane. Related literature For general background, see: Holladay et al. (1991)