SEARCH Articles Figures Tables Alkyl esters Alkyl quaternary ammonium salts Alkyl salts Alkylation quaternary ammonium salts Ammonium salts, alkyl Cinchona Cinchona ammonium salts Cinchona quaternary ammonium salts Cinchona salt Ester quaternary ammonium salts Esters alkylation Quaternary ammonium salts Quaternary salts Salts, alkylation