O=[N+]([O-])c1nn(-c2ccc3c(c2)OCCO3)[n+]([O-])c1NC1CCN(Cc2ccccc2)CC1
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?