O=C(NP(=O)(N1CCOCC1)N1CCOCC1)C1=C(N2CCOCC2)/C(=C\c2ccccc2)CC1
The negative base-10 logarithmic of dissociation constant (pka) for an acid is a direct consequence of the underlying thermodynamics of the dissociation reaction; the pKa value is directly proportional to the standard Gibbs free energy change for the reaction. What is the pka value of this molecule?