*; program(s) used to solve structure: *SHELXS00* (Sheldrick, 0000[@bb00]); program(s) used to refine structure: *SHELXL00* (Sheldrick, 0000[@bb00]); molecular graphics: *ORTEPIII* (Burnett & Johnson, 0000[@bb0]), *ORTEP-0 for Windows* (Farrugia, 0000[@bb0]) and *PLATON* (Spek, 0000[@bb00]); software used to prepare material for publication: *SHELXL00*.  Supplementary Material ======================  Crystal structure: contains datablocks I, global. DOI: [00.0000/S000000000000000