J. Chem. Soc., 1933, 1475 - 1477
F. E. King, Mario Liguori and Robert Robinson
Experiments on the synthesis of physostigmine (eserine). Part IX. An improvement in the synthesis of dl-eserethole
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http://dx.doi.org/10.1039/JR9330001475F. E. King, J. W. Clifton and H. T. Openshaw
A synthesis of ethyl 1-methylpyrrolidine-2-acetate
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http://dx.doi.org/10.1039/JR9420000422Frederick E. King and Robert Robinson
Experiments on the synthesis of physostigmine (eserine). Part VII
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http://dx.doi.org/10.1039/JR9330000270