| http://www.w3.org/ns/prov#value | - An alternative preparation of compounds of Formula 2c, wherein R1 is a hydroxy or an alkoxy group may be effected by replacement of the halide group X of a2-nitro-5-halocarboxylic acid of general Formula ae, with the appropriate hydroxy or alkoxy groups, to give compounds of general Formula af, wherein R??? is hydrogen or lower alkyl.
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