(Z)-3-[(4-Eth-oxy-phen-yl)(hy-droxy)methyl-idene]-1-isopropyl-pyrrolidine-2,4-dione.

In the title compound, C16H19NO4, a potent new herbicide, the dihedral angle between the benzene and pyrrolidine rings is 11.09 (8)°. Intra­molecular O—H⋯O and C—H⋯O hydrogen bonds are observed.