CO/C1=C\C(C)=C\C(C)C(O)C(C)C/C(C)=C/C=C/C(OC)C(C(C)C(O)C(C)C2(O)CC(O)C(C)C(C(C)C)O2)OC1=O
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?