CCCCCCCCCC[C@@H](OC(C)=O)[C@@H]1CC[C@@H]([C@@H]2CC[C@@H]([C@@H](O)CC#C/C=C/CCCCCCC[C@@]3(Sc4ccccc4)C[C@H](C)OC3=O)O2)O1
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?