Gravar-mail: 3,6,14,17-Tetramethoxy-22,23-diphenyl-1,10,12,21-tetraazahexacyclo[19.2.1.0(2,7).0(10,23).0(12,22).0(13,18)]tetracosa-2(7),3,5,13(18),14,16-hexaene-11,24-di­thione