CCN(CC)c1ccc2nc3ccc(/N=N/c4c(O)ccc5ccccc45)cc3[n+](-c3ccccc3)c2c1.[Cl-]
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?