CCCCn1c(=O)[nH]c(=O)c2c1nc(CN1C(=O)c3ccccc3S1(=O)=O)n2CCC
An acid's negative base-10 logarithmic dissociation constant (pKa) follows directly from its underlying thermodynamics; the negative pKa is directly proportional to its standard Gibbs free energy change. What is the negative pKa value of this molecule?