When free compounds are obtained in any step of the above mentioned reactions for the invention, they may be converted into {HEAD ~ salts} in any known method; or when salts are obtained therein, they may be converted into free compounds or any other salts in {TAIL ~ any known method} 
When free compounds are obtained in any step of the above mentioned reactions for the invention , they may be converted into { HEAD ~ salts } in any known method ; or when salts are obtained therein , they may be converted into free compounds or any other salts in { TAIL ~ any known method }
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