Figure 1.
Conceptual strategy of the present work. The present work is originated from DNI-Glu15,48 retaining the effective dinitro substitution as DNI-GABA (1, in step I). Subsequently, we introduced the novel cationic side-chain conception as iDMPO-DNI-GABA (2a) and iDMBO-DNI-GABA (2b, step II) in contrast to the anionic ones.9,53 Finally, we reverse the binding type of GABA as DNI-CO-GABA (3) in step (III).