indophenin
noun
in·do·phe·nin
ˌindəˈfēnə̇n,
ə̇nˈdäfənə̇n
: a blue crystalline compound C24H14N2O2S2 formed by reaction of thiophene with isatin and sulfuric acid and used as a color test for the presence of thiophene in technical benzene
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Merriam-Webster unabridged
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