N#Cc1c(-c2ccccc2)cc(-c2ccccc2)nc1SCC(=O)NCC(=O)O
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?