CCCC(=O)Nc1ncnc2c1ncn2C1OC2COP(=O)(O)OC2C1OC(=O)CCC
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?