CSc1cccc(NC(=O)C2CCN(S(=O)(=O)c3ccc4[nH]c5c(c4c3)CCCCC5)CC2)c1
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?