CCN(CCCNC(=O)Cn1ncc2c3cc(C)ccc3nc-2c1O)c1cccc(C)c1
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?