You know what it looks like… but what is it called?
TAKE THE QUIZ“propionic”
We have one entry that includes the term propionic.
propionic acid
noun: a liquid sharp-odored fatty acid C3H6O2 found in milk and distillates of wood, coal, and petroleum and used especially as a mold inhibitor and flavoring agent
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Merriam-Webster unabridged