prov:value
| - Such compounds may thuspossess as the 3-substitutent a group of the formula ##STR9## wherein R.sup.A and R.sup.B, which may be the same or different, are selected from hydrogen, cyano, lower alkyl e.g. methyl or ethyl, phenyl, substituted phenyl e.g. halo, lower alkyl, loweralkoxy, nitro, amino or lower alkylamino phenyl, lower alkoxycarbonyl, mono- or di-aryl lower alkoxycarbonyl, lower alkylcarb
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