Cc1cccc(N2CCN(C(=O)CCCn3c(=S)[nH]c4cc5c(cc4c3=O)OCO5)CC2)c1C
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?