CCCCn1nnnc1C(c1cccc(OC)c1OC)N1CCC(n2c(O)nc3ccccc32)CC1
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?