prov:value
| - A pharmaceutical composition comprising: a compound having the formula: wherein R1, R2 and R3, are the same or different and are a hydrogen, a nitro, a cyano, a carbamoyl, a halogen, a perfluoroalkyl, a haloalkylamido, an isothiocyanate, an azide, a diazocarbonyl, a substituted oxirane, or a ??-chloroethylamine; R4 is a hydrogen, an alkyl, or is joined to R5; R5 is a hydrogen, a hydroxy, an alkoxy
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