Biocytin is a classical neuroanatomical tracer commonly used to map brain connectivity. Biocytin is a conjugate of D-biotin and L-lysine, where the carboxylate of D-biotin is coupled with the ?-amine of L-lysine via a secondary amide bond.

CMP-Sialic acid sodium salt (CMP-Neu5Ac sodium salt) is a variant inhibitor of UDP-GlcNAc 2-epimerase, the activated form of sialic acid, which is widely found in animals and is involved in the metabolism of organisms.

Diethyl oxalpropionate also known as methyloxalacetic acid diethyl ester or diethyl methyloxalacetate is a member of the class of compounds known as beta-keto acids and derivatives. These compounds are organic compounds containing an aldehyde substituted with a keto group on the C3 carbon atom.