English: Weston, Arthur W.; DeNet, Robert W.; Michaels, R. J. (1953). "Antispasmodics. Basic Esters and Amides of Some Heterocyclic N-Carboxylic Acids". Journal of the American Chemical Society. 75 (16): 4006–4008. doi:10.1021/ja01112a038.
Seemann Carl Von, US2778824 (1957 to American Home Prod).
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