^Polívka Z, Rajšner M, Metyš J, Holubek J, Svátek E, Ryska M, Protiva M (1983). "Antiaminic agents derived from thieno[2,3-c]-2-benzothiepin: 4-(1-Methyl-4-piperidylidene)-4,9-dihydrothieno[2,3-c]-2-benzothiepin and some related compounds". Collection of Czechoslovak Chemical Communications. 48 (2): 623–641. doi:10.1135/cccc19830623.
^Pharmacopoea Bohemoslovenica 4 (1987), vol. 2, p. 132 states that Bisulepinium chloratum (bisulepinium chloride) is trans-[3-(4,9-dihydro-thieno[2,3-c][2]benzithiepin-4-yliden)propyl]dimethylamoniumchlorid (Czech). The cis- isomer is considered as an impurity, max. amount 2.0 %.