| 摘要 |
<p>Compounds of formula I <CHEM> where R<1> is alkyl, alkenyl or alkynyl, each of which is optionally substituted; R<2> and R<3>, which may be the same or different, have rhe same meaning as R<1> or are halogen; and X is O, S or NR<4>, where R<4> is hydrogen or acyl, have valuable fungicidal activity, especially against rice blast.</p> |
