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The process FGI defines "functional group interconversion" in any known target molecule/compound. In FGI existing functional groups get converted in further starting molecule.
The process which converts given target molecule into possible precursor molecule is stated as "Retrosynthesis". This process is utilized for synthesizing organic molecules.
The reactions that show the starting material of the given compounds are shown below.
For the first compound, the reaction is as follows,
For the second compound, the reaction is as follows,
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