CC(=O)NC1C(OCc2ccccc2)OC(CO)C(O)C1OCC(=O)NC(C)C(=O)NC(CCC(=O)OCCNC(=O)c1cccc2cc3ccccc3nc12)C(N)=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?