MetaCyc a small molecule

How to Navigate: A class hierarchy (ontology) allows you to retrieve information according to categories of interest. In the class hierarchy that follows, each line names a single class of biological objects. The levels of indentation indicate a subclass relationship to the class above. The numbers in parentheses indicate the number of instances of that class. Clicking on a class will display a page containing its instances (the biological objects that are direct children of that class). A class page also lists the parent classes and child classes, allowing you to navigate up and down in the hierarchy. Note: if the categories below are missing the expand icon, but you believe they they should be expandable, try reloading the page.

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 42:D459-D471 2014
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