| http://www.w3.org/ns/prov#value | - east one of R.sub.1 and R.sub.3 is other than hydrogen;(ii) that where R.sub.1 is hydrogen and X is oxygen and Y is NOH, R.sub.3 is not chloro; and(iii) that at least two of R.sub.1 -R.sub.4 are other than hydrogen.2. 5,7-Dichloro-1,2,3,4-tetrahydroquinoline-2,3,4-trione-3-oxime, a compound of claim 1.3. 5,6,7-Trichloro-2,3,4-tetrahydroquinoline-2,3,4-trione-3-oxime, a compound of claim 1.4.
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