dead-end metabolite

https://doi.org/10.1351/goldbook.14565
Substance formed by a microbe’s metabolism of a substrate (most often during cometabolism) that cannot be further metabolized by that organism.
Note: Dead-end metabolites may be further metabolized by coexisting organisms.
Source:
PAC, 2009, 81, 829. (Glossary of terms used in ecotoxicology (IUPAC Recommendations 2009)) on page 864 [Terms] [Paper]