COC(=O)C1=C(C)N(CCc2cc(OC)c(OC)c(OC)c2)C(=O)N[C@H]1c1cccs1
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?