English: Manoury, Philippe M.; Dumas, Andre P.; Najer, Henry; Branceni, Dan; Prouteau, Monique; Lefevre-Borg, Francoise M. (1979). "Synthesis and analgesic activities of some (4-substituted phenyl-1-piperazinyl)alkyl 2-aminobenzoates and 2-aminonicotinates". Journal of Medicinal Chemistry. 22 (5): 554–559. doi:10.1021/jm00191a017.
Don Pierre Rene Lucien Giudicelli, et al. US4017623 (1977 to Synthelabo SA).
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