C/C1=N/NC(=S)NCCCN2CCN(CCCNC(=S)N/N=C(/C)C=NNC(=S)NCCCN3CCN(CCCNC(=S)NN=C1)CC3)CC2
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?