CC1CCCN(C(=O)C(=O)Nc2ccc3nc4n(c(=O)c3c2)CCCCC4)C1
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?