English: Banholzer VR, Pook KH. Synthese von anticholinerg wirksamen N-Alkylnorscopolaminen und deren Quartärsalzen unter besonderer Berücksichtigung des Bronchospasmolytikums (-)-N-Ethylnorscopolamin-methobromid (Ba 253 BR) [Synthesis of anticholinergically active N-alkylnorscopolamines and their quaternary salts with special consideration of the bronchospasmolytic (-)-N-ethylnorscopolamine methobromide (Ba 253 BR)]. Arzneimittelforschung. 1985;35(1A):217-28. German. PMID: 4039163.
Dharma, AP; Oxitropium bromide. Drugs Fut 1979, 4, 2, 117.
Rolf Banholzer, Werner Schulz, Gerhard Walther, Helmut Wick, Karl Zeile, US3472861 (1969 to Boehringer Sohn Ingelheim).
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