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How to go from bmk glycdic acid (sodium salt) to P2P? Should I just add HCl and heat it?

Can I use 39% dimethylamine aqueous solution instead of methylamine gas? If yes then what should be the ratio?

hey. i have a question. in my case the pills contain 5mg levocetrizine hcl and 120mg pse hcl. there is a coating of ferric oxide. Since both levo and pse are amines and have similar polarity i don't know how to separate the two. also would it be a problem is i didn't remove the levo? plz help.