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No collaborator, I did not determine the solubility limits of the compound I made for you.

Also the trace presence of ion exchange resin (which I expect you to filter off, seeing as you shouldn't be using un-sterile solutions for time course experiments) does not mean you should try to back-out the "correct" mass. The visible undissolved material is clearly less than a milligram, which is within the margin of error of your balance.