Oc1ccccc1C1C=C(c2ccc3c(c2)OCO3)NC(c2c(F)cccc2Cl)N1
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?