abstract |
Compounds useful as antimicrobial and microbicidal compounds have the formula <IMAGE> wherein R1 is optionally halogen-substituted lower alkyl or optionally substituted aryl, R2 is hydrogen and R3 is halogen, or R2 and R3 conjointly represent a bond, R4 is nitrile (-CN) or carboxylic acid amide (-CONH2) and Hal is halogen. |