2-[1-(4-Ethoxy-phen-yl)-2-oxo-4-styryl-azetidin-3-yl]isoindoline-1,3-dione.

The title compound, C(27)H(22)N(2)O(4), contains a nearly planar four-membered ß-lactam ring, which makes dihedral angles of 74.64 (12), 1.70 (11) and 73.67 (12)° with the nine-membered ring system, the benzene ring and the phenyl ring, respectively. The crystal structure is stabilized by C-H⋯O and C-H⋯π inter-actions and a π-π inter-action [centroid-centroid distance = 3.4505 (19) Å] is also present.

3,4-Dimeth-oxy-N-(3-nitro-benzyl-idene)aniline.

The title compound, C(15)H(14)N(2)O(4), has two crystallographically independent mol-ecules in the asymmetric unit. In both mol-ecules, the nitro and the two meth-oxy substituents are coplanar with the benzene rings to which they are attached. The benzene rings are nearly coplanar, with dihedral angles between the two benzene rings of 10.39 (8) and 5.95 (8)° in the two mol-ecules. The two independent mol-ecules in the asymmetric unit are rotated with respect to each other such that the dihedral angles between equivalent benzene rings are 49.11 (8) and 63.93 (8)°. In the crystal structure, inter-molecular C-H⋯O hydrogen-bond contacts and a weak C-H⋯π inter-action are observed.