| http://www.w3.org/ns/prov#value | - The (+), (-) and (???) forms of the compounds having the general formula I ##STR12## wherein R1 is hydrogen or a methoxy, ethoxy, propoxy, methylthio, ethylthio, propylthio, fluoro, chloro, bromo, methyl, ethyl, nitro or amino group, and R2 is a hydrogen or methyl group and R3 is the group ##STR13## and R4 and R5 are the same or different groups and each is a fluoro, bromo or chloro group.
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