CC(NC(=O)c1ccc(OP(=O)(OCC2=CC(=O)c3ccccc3C2=O)N(C)CCCCCl)cc1)c1ccc(OCC2CCCCC2)c(C(N)=O)c1
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?