[ARGOS++]

Dear nj_bartel;

Your right in the case of the ester as the reference compound, but then we can excess the game and name also all methyl-, ethyl-,  and the t-buthyl- groups too.

But I don’t know if such makes very much sense.

Good Luck!
                    ARGOS⁺⁺

[macman104]

I would neither label the benzene as a functional group, nor the alkyl piece.  The benzene is the base of the molecule, and the alkyl is not really a functional group in this respect.  Otherwise, the t-butyl is a functional group as well.  Maybe if you want to point out structural "features" of the molecule...

[sjb]

Depending on your level, you may also be able to classify the R¹R²NC(=O)OR³ units (that you have separately labelled as amides / esters) as carbamates, instead.

S

[nj_bartel]

I'm just working off what we had to do in my o chem class    We would have definitely been expected to identify an arene there.