Cc1ccc2cc(C(c3nnnn3C3CCCC3)N3CCN(c4ccccc4)CC3)c(O)nc2c1
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?