prov:value
| - e the integers 0 or 1; (b) B is represented by the following graphic formula: ##STR17## wherein R6 is hydrogen, C1 -C4 alkyl, C1 -C4 alkoxy, fluoro, or chloro, each R7 is a C1 -C4 alkyl, C1 -C4 alkoxy, hydroxy, chloro, or fluoro, and d is an integer from 0 to 2; and (c) B' is selected from the groups represented by the following graphic formulae: ##STR18## wherein X is oxygen, Y is carbon or oxyge
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