C=C1c2ccccc2C(=O)c2c1c1c(C(=O)OC)c(O)ccc1n2Cc1ccccc1
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?