C=C1CCC2CC1[C@@H](C(=O)c1c[nH]c3ccccc13)NC2(C)C
An acid's negative base-10 logarithmic dissociation constant (pKa) follows directly from its underlying thermodynamics; the negative pKa is directly proportional to its standard Gibbs free energy change. What is the negative pKa value of this molecule?