CCc1n[nH]c(C(=O)N2CCCC(C(=O)c3cccc(OC(C)C)c3)C2)c1C
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?