Examlex
Which of the following is NOT classified as a stimulant?
Propionic Acid
A naturally occurring carboxylic acid with chemical formula C3H6O2, used in food preservation.
Alanine
A nonessential amino acid that is used in the biosynthesis of proteins.
Amino Group
A functional group consisting of a nitrogen atom attached by single bonds to hydrogen atoms, alkyl groups, or aryl groups.
Amino Acid
Organic compounds containing an amine group, a carboxylic acid group, and a side chain that varies between different amino acids, key building blocks of proteins.
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