Cc1cc(C)c2nc(O)c(C(c3nnnn3Cc3ccc4c(c3)OCO4)N3CCCC3)cc2c1
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?