CCCCCCCN1C(=O)C(O)(c2ccc(C3(O)C(=O)N(CCCCCCC)c4ccccc43)s2)c2ccccc21
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?