Difluoro(4-(1,1-dimethylethyl)-2-{1-[4-(1,1-dimethylethyl)-3,5-dimethyl-2H-pyrrol-2-ylidene-N]ethyl}-3,5-dimethyl-1H-pyrrol-2-ylidene-N]ethyl}-3,5-dimethyl-1H-pyrrolato-N)boron 746169-500MG