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AICAR, aminoimidazole carboxamide ribonucleotide; ATP, adenosine tri-phosphate; FAICAR, formyl aminoimidazole carboxamide ribonucleotide; IMP, inosine monophosphate; mRNA, messenger RNA; PRPP, phosphoribosyl pyrophosphate; PurH, bifunctional purine biosynthesis protein PurH.

AICAR, aminoimidazole carboxamide ribonucleotide; ATP, adenosine tri-phosphate; FAICAR, formyl aminoimidazole carboxamide ribonucleotide; IMP, inosine monophosphate; mRNA, messenger RNA; PRPP, phosphoribosyl pyrophosphate; PurH, bifunctional purine biosynthesis protein PurH.

Violet.—Acid violet, red violet, regina violet, formyl violet, violamine B, fast violet, azo acid violet, erio violet, lanacyl violet.

This unique absorbance appears to occur thanks to a chemical decoration known as a formyl group on the chlorophyll’s carbon number two.

Notwithstanding these errors, the value of the “ethyl theory” was perceived; other radicals—formyl, methyl, amyl, acetyl, &c.—were characterized; Dumas, in 1837, admitted the failure of the etherin theory; and, in company with Liebig, he defined organic chemistry as the “chemistry of compound radicals.”