rac-Ethyl (2Z)-3-{2-[(Z)-4-eth­oxy-4-oxobut-2-en-2-yl­amino]­cyclo­hexyl­amino}­but-2-enoate

The asymmetric unit of the title compound, C(18)H(30)N(2)O(4), contains two independent mol­ecules. In each mol­ecule, the cyclo­hexane ring adopts a chair conformation with equatorial orientation of the substituents, and the conformation is stabilized by two intra­molecular N—H⋯O hydrogen bonds, forming rings of S(6) graph-set motif. One eth­oxy group and one ethyl group are disordered over two sets of sites with refined occupancy ratios of 0.704 (2):0.296 (2) and 0.505 (3):0.495 (3), respectively. In the crystal, a weak inter­molecular C—H⋯O hydrogen inter­action is observed, involving the O atom of the major component of the disordered eth­oxy group.