O=C1/C(=C/c2ccc(O)c(CN3CCCCC3)c2)CCC/C1=C\c1ccc(O)c(CN2CCCCC2)c1
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?