COP(=O)(OC)/C(=C\c1cn(C(c2ccccc2)(c2ccccc2)c2ccccc2)cn1)NC(C)=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?