CC1(c2ccc3ccccc3c2)NC(=O)N(CC(=O)N2CCC(C(N)=O)CC2)C1=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?