Is there a way to search for adducts by exact mass?
I guess that would be what you are looking for:
http://www.chemcalc.org/mf_finder/mfFinder_em_new
This one gives you theoretical combinations of atoms, that fit the mass.

You could also check the sdbs database for organic compounds.
https://sdbs.db.aist.go.jp
This one gives you existing compounds but it is rounding to 1 decimal so it gives you everything with 217.1 which is not perfect.

I just used the frist calc and then checking all close results (green) at SigmaAldrich to see, which formula matches a compound they sell. There are just two from the List:
$\ce{C10H16ClNO2}$ and $\ce{C11H11N3O2}$

So I would focus on these.