CCOC(=O)C1CCN(C(=O)CN2c3ccc(C(C)C)cc3-c3ccccc3S2(=O)=O)CC1
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?