Gravar-mail: Crystal structure of 7′-(4-chloro­phen­yl)-2′′-(4-meth­oxy­phen­yl)-7′,7a’,7′′,8′′-tetra­hydro-1′H,3′H,5′′H-di­spiro­[indoline-3,5′-pyrrolo­[1,2-c]thia­zole-6′,6′′-quinoline]-2,5′′-dione and an unknown solvent