CC1(C)CC2=Nc3nc(SCCN4CCOCC4)nc(O)c3C(c3cccs3)C2=C(O)C1
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?