Benzoic acid,3,3'-(1,2-ethynediyl)bis[5-[[3-[[(4-methoxyphenyl)imino]methyl]-5-(1-oxo-2,5,8,11-tetraoxadodec-1-yl)phenyl]ethynyl]-,bis[2-[2-(2-methoxyethoxy)ethoxy]ethyl] ester