Dimethyl 2-(methylaminomethylene)malonate

In the title compound, C7H11NO4, which is an example of a push–pull alkene, a network of N—H⋯O and C—H⋯O interactions helps to establish the crystal structure. The investigated crystal turned out to be a non-merohedral twin with a ratio of twin components of 0.442 (3):0.558 (3). Two pairs of independent molecules (Z′ = 4) are linked by intermolecular N—H⋯O hydrogen bonds, forming independent chains; the chains are connected via intermolecular C—H⋯O contacts, building a three-dimensional network.