CCOc1ccccc1NC(=O)CCc1c(C)nn(-c2ccc(N3CCCCC3)nn2)c1C
An acid's negative base-10 logarithmic dissociation constant (pKa) follows directly from its underlying thermodynamics; the negative pKa is directly proportional to its standard Gibbs free energy change. What is the negative pKa value of this molecule?