Starting from benzene, how would you make the following compound? 
Definitions:
Isotopic Signatures
The unique ratios of isotopes within substances that can reveal details about the origins and history of geological and biological materials.
Biomarkers
Biomolecules present in blood, various bodily fluids, or tissues indicating the presence of either normal or abnormal processes, or specific conditions or diseases.
Toxic Atmosphere
An environment where the air contains harmful substances in quantities that can damage health or cause death to living organisms.
Limiting Factor
An environmental condition that restricts the growth, abundance, or distribution of an organism or a population within an ecosystem.
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