You know what it looks like… but what is it called?
TAKE THE QUIZ“cinnamic”
The following 3 entries include the term cinnamic.
cinnamic acid
noun: a white crystalline odorless acid C9H8O2 found especially in cinnamon oil and storax
cinnamic alcohol
nouncinnamic aldehyde
noun: cinnamaldehyde
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Merriam-Webster unabridged