CCn1c2ccccc2c2cc(/C=N/n3c(S)nnc3-c3cc(C)[nH]n3)ccc21
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?