Oc1c(NCn2nc(CCCCCCCCc3nn(CNc4ccc5ccccc5c4O)c(=S)o3)oc2=S)ccc2ccccc12
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 negative pKa value is directly proportional to the standard Gibbs free energy change for the reaction. What is the negative pKa value of this molecule?