It contains about 20% of cinnamic acid in addition to 18 or even more of benzoic.
Other constituents of the oil are cinnamyl acetate and cinnamic acid.
An isomer of cinnamic acid known as allo-cinnamic acid is also known.
By the addition of diluted sulphuric acid, the aldehyde of cinnamic acid is afterwards procured pure.
Wolff has converted this alcohol by oxidizing agents into cinnamic acid.