Gravar-mail: Crystal structure of N-[(8E)-12-methyl-14-phenyl-10,13,14,16-tetra­aza­tetra­cyclo­[7.7.0.0(2,7).0(11,15)]hexa­deca-1(16),2,4,6,9,11(15),12-heptaen-8-yl­idene]hydroxyl­amine 1,4-dioxane hemisolvate