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Phthalide is used as a food additive [EAFUS] ("EAFUS: Everything Added to Food in the United States. [http://www.eafus.com/]")

Phenylglyoxal belongs to the class of organic compounds known as phenylacetaldehydes. These are compounds containing a phenylacetaldehyde moiety, which consists of a phenyl group substituted at the second position by an acetalydehyde.

Phthalaldehyde is a dialdehyde in which two formyl groups are attached to adjacent carbon centres on a benzene ring. It has a role as an epitope. It is a dialdehyde and a member of benzaldehydes. A reagent that forms fluorescent conjugation products with primary amines. It is used for the detection of many biogenic amines, peptides, and proteins in nanogram quantities in body fluids.

6E-Octene-2,4-diynoic acid

6Z-Octene-2,4-diynoic acid

A dialdehyde in which two formyl groups are attached to adjacent carbon centres on a benzene ring." []