prov:value
| - A contemplated compound can be defined by the following structural formula: ##STR22## where B is a carbon or nitrogen atom and D is a carbon, nitrogen, oxygen, or sulfur atom optionally substituted by or forming a lower alkyl, amine lower alkyl carboxamide, alcohol, lower alkyl alcohol, lower hydroxy alkyl ether, carboxylic acid, lower alkyl carboxylic acid, carbonyl, sulfoxide, or alkyl substitut
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