N,N'-bis(2,7-di(tert-butyl)-5-cyano-9,9-dimethyl-9H-xanthen-4-yl)-1,4,5,8-naphthalenetetracarboxylic-1,8(4,5)-diimide
n,n'-bis(2,7-di(tert-butyl)-5-cyano-9,9-dimethyl-9h-xanthen-4-yl)-1,4,5,8-naphthalenetetracarboxylic-1,8(4,5)-diimide