Is there a good synonym for "a group connected to a N-atom"?

I'm writing a publication in which I compare the effect of alkyl, alkene and similar chains of different length connected to a N-atom of a heterocyclic organic compound. Often I have to refer to these chains, *without the N-atom*.


Right now I'm using something like "the ethyl/propyl/etc. group connected to the N-atom", which feels awkward. Is there a better chemical term I could use? Based on my online research, *amine group* or *amine substituent* appears to be the closest, but it includes the nitrogen itself.


Some examples (not from my work):


[![a few examples](https://i.stack.imgur.com/RmBOXm.png)](https://i.stack.imgur.com/RmBOXm.png)


Is there a term that properly describes the encircled parts?




I think "N-substituent" is just fine.


A substituent refers to whatever is sticking off something. The prefix "N-" doesn't change that; rather, it qualifies what it is sticking off. So the N-substituent doesn't mean "the nitrogen plus the substituent", but rather "the substituent sticking off the nitrogen".


(As a parallel example: in, say, aromatic rings it is common to refer to a C-2 substituent or an *ortho*-substituent or something. This doesn't include the carbon on the ring, it just refers to whatever's sticking off it.)


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Inspired by the locant *N*- and by biochemical nomenclature for glycolisation, I could see use of the term “*N*-linked moiety”.


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