Cc1cccc(N=C(S)N(CCCN2CCOCC2)C(C)c2cc3ccccc3o2)c1C
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?