CCOC(=O)CCCCC(=O)c1[nH]c(O)nc1CSc1nnc2c3ccccc3n(C(C)C)c2n1
An acid's negative base-10 logarithmic dissociation constant (pka) follows directly from its underlying thermodynamics; pKa is directly proportional to its standard Gibbs free energy change. What is the pka value of this molecule?