Boron, [2-​[4-​[2-​[2-​[([2,​2'-​bi-​1H-​pyrrol]​-​5-​yl-​κN1)​methylene]​-​2H-​pyrrol-​5-​yl-​κN]​ethenyl]​phenoxy]​-​N-​[6-​[(2,​5-​dioxo-​1-​pyrrolidinyl)​oxy]​-​6-​oxohexyl]​acetamidato]​difluoro-​, (T-​4)​-