1-(6-Amino-1,3-benzodioxol-5-yl)-3-(3,4,5-tri­methoxy­phenyl)­prop-2-en-1-one, C19H19NO6, (I), contains an intramolecular N—H⋯O hydrogen bond and a weak C—H⋯O hydrogen bond, which forms a C(10) chain motif running parallel to the c axis. The 6-amino-1,3-benzo­dioxol-5-yl moieties are involved in π–π stacking. 1-(6-Amino-1,3-benzo­dioxol-5-yl)-3-[4-(N,N-di­methyl­amino)­phenyl]­prop-2-en-1-one, C18H18N2O3, (II), crystallizes with two mol­ecules in the asymmetric unit. The main feature of the supramolecular structure of (II) is the formation of a centrosymmetric hydrogen-bonded tetramer with an R{_8^4}(16) motif.