| abstract |
Phosphonic acid diester derivatives represented by general formula (1) which are useful as a remedy for hyperlipidemia and diabetes,nan antitumour agent and a preventive or remedy for cataract, wherein R 1 represents cycloalkyl, etc.; R 2 represents hydrogen, phenyl ornlower alkyl; R 3 and R 4 represent each lower alkyl; and A represents a heterocycle selected from among pyrazine, thiophene andnphenyl-substituted thiazole rings. |