CCOC(=O)C1(CCCc2ccccc2)CCN(C(=O)[C@@H]2C[C@@H](C)N=C(S)N2)CC1
The negative base-10 logarithmic of dissociation constant (pKa) for an acid is a direct consequence of the underlying thermodynamics of the dissociation reaction; the negative pKa value is directly proportional to the standard Gibbs free energy change for the reaction. What is the negative pKa value of this molecule?