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A solution of water and citric acid at pH 3.5-4 is brought to heat and mixed with MHRB powder as with a normal A/B (repeat three times, discard powder).


Then simply evaporate/dehydrate.


Add dry-acetone (perhaps w/ extra citric acid), then filter into dry-FASA. Wash the solids two more times.


The rest is FASA as usual (with MEK at the end for a more pleasant smell).


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