MetaCyc a small molecule

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Summary: This class describes small molecules, that is, chemical compounds that are not macromolecules. Some subclasses of this class define "generic reaction substrates." Those classes are used as substrates in some reactions as a way of defining reactions that operate on classes of compounds. Such generic substrates often have class names beginning with "a", such as "a fatty acid" or "a 2-oxo acid".

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Please cite the following article in publications resulting from the use of MetaCyc: Caspi et al, Nucleic Acids Research 46(D1):D633-D639 2018
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