(E)-1-(2-Amino­phen­yl)-3-(3,4,5-trimeth­oxy­phen­yl)prop-2-en-1-one

In the asymmetric unit of the title chalcone derivative, C(18)H(19)NO(4), there are three crystallographically independent mol­ecules (mol­ecules A, B and C). In mol­ecule A, the dihedral angle between two benzene rings is 12.22 (10)° and the plane of the central prop-2-en-1-one unit makes dihedral angles of 11.02 (13) and 2.64 (12)° with the two adjacent benzene rings. The corresponding angles in mol­ecule B are 12.35 (10), 18.78 (12) and 7.29 (12)°, respectively, and those in mol­ecule C are 15.40 (10), 15.62 (3) and 3.19 (13)°. In each mol­ecule, an intra­molecular N—H⋯O hydrogen bond generates an S(6) ring motif. In the crystal structure, the mol­ecules B are linked by inter­molecular N—H⋯O hydrogen bonds into a zigzag chain along the c axis, while the mol­ecules A and C are linked together via an N—H⋯O hydrogen bond into a dimer. Adjacent dimers are further connected by N—H⋯N hydrogen bonds into a three-dimensional network. Weak C—H⋯O and C—H⋯π inter­actions are also observed.