O=C(c1cnc2ccc(S(=O)(=O)N3CCC4(CC3)OCCO4)cc2c1O)N1CCOCC1
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?