prov:value
| - The compounds of this invention have the following structural formula wherein R and R1 are hydrogen or C1-C4 alkyl, preferably methyl, most preferably R and R1 are hydrogen, R?? is chlorine, bromine, or iodine, R3 is hydrogen or halogen, preferably iodine or chlorine, most preferably R3 is hydrogen, and R4 is hydrogen, chlorine, bromine, iodine, C1-C4 alkyl, preferably methyl, C1-C4 alkoxy, prefer
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