CCC(c1nnnn1CCc1ccccc1)N(Cc1ccco1)Cc1cc2c(C)ccc(C)c2nc1O
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?