CCCCOC(=O)NC(=O)c1cn(CCSCCOC(=O)NCCCCCCNC(=O)OCCSCCn2cc(C(=O)NC(=O)OCCCC)c(=O)[nH]c2=O)c(=O)[nH]c1=O
A higher negative pKa value denotes a less powerful acid. What is this molecule's negative pKa value?