| 摘要 |
This invention provides compounds of the formula, <IMAGE> I in which R1 signifies straight or branched chain alkyl in which a single methyl group is replaced by a mono-, di- or tri-halomethyl group; R2 signifies hydrogen or straight or branched chain lower alkyl and X and Z each independently signifies oxygen or sulphur, which are useful as animal feed additives and amoebicidal agents. |
