(Z)-3-Methyl-N-(7-nitroacridin-3-yl)-2,3-dihydro-1,3-benzothiazol-2-imine from laboratory powder diffraction data.

The title compound, C21H14N4O2S, belongs to a family of mol­ecules possessing nonlinear optical properties in solution. Its structure has been solved from laboratory X-ray powder diffraction data using a new direct-space structure solution method, where the atomic coordinates are directly used as parameters and the mol­ecular geometry is described by restraints. The mol­ecular packing is controlled by two systems of π–π inter­actions and one weak edge-to-face inter­action.