185547-78-8 Heptanedioic acid,4,4'-[[2,2-bis[[3-[[6-[[12-[[3-carboxy-1,1-bis(2-carboxyethyl)propyl]amino]-1,12-dioxododecyl]amino]-2-pyridinyl]amino]-3-oxopropoxy]methyl]-1,3-propanediyl]bis[oxy(1-oxo-3,1-propanediyl)imino-6,2-pyridinediylimino(1,12-dioxo-12,1-dodeca