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Formation of bismuth citrate ([Bi2(cit)2]22n−) or Bi(cit)) polymeric structure by the dimeric unit ([Bi2(cit)2]22n−). The polymeric framework probably coats on the ulcer craters to prevent the erosion of gastric acid. The negatively charged ([Bi2(cit)2]22n−) framework is balanced by cations. Color code: Bi, yellow; C, gray; O, red; cation, blue.
