CCOC(=O)NC(=O)c1cn(CCOCCOC(=O)NCCCCCCNC(=O)OCCOCCn2cc(C(=O)NC(=O)OCC)c(=O)[nH]c2=O)c(=O)[nH]c1=O
A lower number of pka indicates that the acid dissociates more entirely in water. What is pka of the molecule?