CC(NC(=O)c1c2c(nc3ccccc13)C(=O)N(C1CCCCC1)C2)c1ccccc1
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?