Indole is an aromatic heterocyclic organic compound. It has a bicyclic structure consisting of a six-membered benzene ring fused to a five-membered nitrogen-containing pyrrole ring.

Monoethyl pimelate is a PROTAC linker, which refers to the alkyl/ether composition.

Phenylacetylglycine is an acyl glycine. Acyl glycines are normally minor metabolites of fatty acids. The presence of phenylacetylglycine in urine has been confirmed for dogs rats and mice. However the presence of this compound in human urine is controversial. GC-MS studies have not found this compound while NMR studies claimed to have identified it.