Synthesis and crystal structure of bis[(7,9-diaza-3,14-dithiatetracycle[15,4,0,04,5,013,14]nonacosa-1(17),18,20,4(22),23,25,13(26),27,29-nonaene)chlorocopper(II)] tetrachlorodicuprate(I) bismethanol. Atypical non-planar conformation of the [Cu2Cl4]2− anion