CC(=O)OC1=C2CC[C@H]3C4CC[C@H](OC(C)=O)[C@@]4(C)CCC3[C@@]2(C)CC(C#N)C1=O
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?