the salts aren't very soluble in acetone
you can do a simple a/b extraction, dissolve the tablets in acidic water, vinegar is fine, then filter or decant from the insoluble paste.
Wash the acidic extract with non-polar solvent, then basify and extract with the same solvent, then convert back to salt form, HCl is the best for this one. You can precipitate the salts out of the toluene or xylene by adding HCl in IPA, you dont need it to be super dry in this case so just add 1mL of muratic acid (37% aq HCl) to 10mL of Isopropanol, and add that solution dropwise. You can add some dry MgSO4 to the solution too to suck up a bit of the water too.
Naphtha isn't good in this case better use xylene or toluene though.
A simpler method which may be better for you,
2C-B HCl is poorly soluble in conc. HCl solutions. So extract the tablets with vinegar as before, care to use the least possible amount of volume for the best yield, filter or decant, then precipitate the 2C-B HCl with addition of conc. HCl. Store in refrigerator overnight for full precip. This method is simpler but will yield less.
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