C=CC1=C(C)/C(=C/C2=N/C(=C\c3[nH]c(CC4NC(=O)C(C)/C4=C\C)c(C)c3CCC(=O)O)C(CC(=O)O)=C2C)NC1=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?