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Chemical structure for antispasmodic agents available in North America. (a) alverine, (b) dicyclomine, (c) hyoscine, (d) hyoscyamine, (e) mebeverine, (f) otilonium, (g) pinaverium, (h) trimebutine. Chemical structures reprinted from PubChem, https://pubchem.ncbi.nlm.nih.gov
