COC(=O)C1(CCC(=O)N(C)c2ccccc2)NNC2C(=O)N(c3ccccc3)C(=O)C21
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?