CC(=O)c1cc(C(=O)N2CCc3c([nH]c4ccccc34)C2C2CCCCC2)[nH]n1
The negative base-10 logarithmic of dissociation constant (pka) for an acid is a direct consequence of the underlying thermodynamics of the dissociation reaction; the pKa value is directly proportional to the standard Gibbs free energy change for the reaction. What is the pka value of this molecule?