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acetic acid acetone active air-dried salt akuammidine akuammine amorphous alkaloids analysis anhydrous animals antimony atoms bark base benzene bird malaria boiling Calc cent Chem chloroform cinchona alkaloids cinchona febrifuge cinchonidine cinchonidine tartrate cinchonine colourless needles colourless prisms compound containing corr crude cinchonine crystallised decomp difference dissolved dose dried drug dry salt ester ether EtOH experiment extraction febrifuge fractions H-C C-H HCl requires Cl hydriodide hydrochloric acid hydrochloride hydrogen hydroquinine infection lactone malaria melting point mercuric method methoxyl methyl methylamine mice mixture mouse obtained p-aminophenylstibinic acid p-carbamidophenylstibinic picrate polarimetric prepared quinetum quinidine quinine quinine and cinchonidine quitenine ratio requires H₂O residue samples semicarbazone separated sodium soluble solvent stibacetin stibamine glucoside Stibamine glucoside W.3 substance T. A. HENRY Table tartrate terpene terpinolene therapeutic total alkaloids toxicity trypanocidal trypanosomes urea stibamine Brahmachari WELLCOME CHEMICAL RESEARCH yield