Cc1ccc2c(c1)[nH]c1c(N3CCN(Cc4ccc5c(c4)OCO5)CC3)ncnc12
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?