7-Eth­oxy-4′-methoxy­isoflavone (monoethyl­formononetin)

The title compound, C(18)H(16)O(4), is composed of a benzopyran­one core with a 4-methoxy­phenyl subsituent in the 3-position and an additional eth­oxy group in the 7-position. The benzopyran­one ring is not coplanar with the benzene ring, the dihedral angle between them being 41.76 (7)°. The meth­oxy and eth­oxy substituents are nearly coplanar with the ring systems to which they are attached. Individual mol­ecules are linked by two kinds of inter­molecular hydrogen bonds into chains containing classical R (2) (2)(8) rings. The chains are further assembled by aromatic F-tape and T-tape stacking inter­actions and additional inter­molecular hydrogen bonding to give a two-dimensional network.