C[C@H](O)C#Cc1ccc2c(c1)O[C@@H](CN(C)Cc1ccc(-c3ccccc3)cc1)[C@H](C)CN([C@@H](C)CO)S2(=O)=O
An acid's negative base-10 logarithmic dissociation constant (pKa) follows directly from its underlying thermodynamics; the negative pKa is directly proportional to its standard Gibbs free energy change. What is the negative pKa value of this molecule?