| 摘要 |
A compound of the formula: <IMAGE> wherein X is a member selected from the group consisting of hydrogen, alkyl of from 1 to 3 carbon atoms, inclusive, chlorine or bromine; Y is a member selected from the group consisting of hydrogen, chlorine or bromine and R is a member selected from the group consisting of hydrogen or lower alkyl of from 1 to 3 carbon atoms.
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