O=C(COc1ccccc1)Nc1c(C(=O)N2CCC(N3CCCCC3)CC2)oc2ccccc12
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?