Lansoprazole, 2-({[3-methyl-4-(2,2,2-trifluroethoxy)pyridin-2-yl]methyl}sul
finyl)-1H-benzimidazole, C16H14F3N3O2 S, is an antiulcerative agent. The mo
lecules in the lattice are held together by intermolecular hydrogen bonds b
etween the NH group of benzimidazole and the sulfinyl O atom.