O=C1[C@H]2CC[C@H]3/C(=N\OC[C@@H](O)COCc4ccco4)C[C@@H](O)[C@@H](O)[C@@H]3[C@@H]2C(=O)N1Cc1ccc2c(c1)OCO2
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?