Gravar-mail: (4S)-4-(3,4-Dichloro­phen­yl)-1′-methyl-4′-phenyl-3,4-dihydronaphthalene-2-spiro-3′-pyrrolidine-2′-spiro-1′′-acenaphthyl­ene-1,2′′(2H,1′′H)-dione