Abstract
The title compound, C20H16N2O, (I), has been unwittingly obtained from the slow evaporation of a saturated solution of commercial benserazide hydro-chloride [benserazide, (II), being one of the principal therapeutic compounds used for the management of Parkinson's disease, mostly used in combination with levodopa]. The mol-ecule of (I) is composed of two planar 4-methyl-quinoline aromatic moieties [maximum deviations of 0.0104 (18) and 0.016 (2) Å], almost perpendicular to each other [dihedral angle = 89.5 (2)°], bridged by an O atom. The supra-molecular organization consists of a π-bonded chain, resulting from the stacking of mol-ecules related by inversion centres located along direction [111].