What is the structure of the molecules?

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The molecular structure shows that the molecule has a positively charged amine group which can then bond to the carboxylate groups on the side chains in the mouth of the sodium channel, blocking it. The bond forms due to the electrostatic attraction between the positively charged guanidine group and negatively charged carboxylate groups, forming a strong ionic bond. The bond means that a large amount of energy is required to overcome the attraction and break the bond, unblocking the channel. The molecule below is also relatively small in size, allowing the molecule to utilise...
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