CCCn1c(N)c(C(=O)CSc2nc(C3CC3)n(-c3ccccc3)n2)c(=O)[nH]c1=O
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?