| 摘要 |
An anti-Helicobacter pylori agent comprising a compound represented by formula (I) wherein A represents an aromatic ring group which may be substituted; R<1> and R<2>, whether identical or not, each represents a hydrogen atom or a hydrocarbon group which may be substituted; R<3> and R<4>, whether identical or not, each represents a hydrogen atom, a hydrocarbon group which may be substituted, an acyl group, a carbamoyl group which may be substituted, or a carboxyl group which may be esterified; or a salt thereof. |
