What is the IUPAC systematic name for the above compound.
So I know that carboxylic acids have highest priority. Now the length of carbon chain is 7. So I think the name should be 7-ammonioheptanoic acid. Am I correct?
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Interestingly, Ammonium salts come above acids in the seniority table for functional groups (Reference: Wikipedia). Also, the ion in question has an alkyl group attached to it, which makes the suffix aminium rather than the commonly used ammonium. (Reference: Gold Book, Wikipedia) This means that the correct name of the compound is 6-carboxyhexan-1-aminium. This was also checked with ChemDraw online, as mentioned in the comments.