CC(C)C[C@H]1CN([C@@H](Cc2ccc(O)cc2)CN2CCC[C@@H]2CN2C(=S)NC[C@@H]2Cc2ccccc2)C(=S)N1CC1CCCCC1
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?