prov:value
| - In Formula IB, X X X and X; may be hydrogen, halogens such as fluorine, bromine and chlorine; lower alkyl radicals such as methyl, ethyl and propyl; halogenated alkyl such as chloromethyl, trifiuoromethyl, etc.; lower alkoxy such as methoxy; and aryl radicals such as phenyl, p-chlorophenyl, o,p-dichloropheny1, etc.; R, R and R may be aliphatic or aromatic which can contain heterocyclic groups and
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