| abstract |
Novel chalcone ethers of the formula WHEREIN R1, R2, R3 and R4 are independently one selected from the group consisting of hydrogen atom and hydroxy, lower alkyl, lower alkoxy and acyloxy groups, and one of Z1 and Z2 is one selected from the group consisting of the groups represented by the formula (II), THE OTHER OF Z1 and Z2 is one selected from the group consisting of the groups represented by the formula (II) and (III) are useful compounds having remarkable anti-gastric ulcer activity and extremely low toxicity. |