Phosphorylcholine is widely present in the biological world, which is a phospholipid present in the eukaryotic biofilm, and also in the symbiotic bacteria or pathogens associated with eukaryotes.

L-Pipecolic acid is a breakdown product of lysine accumulates in body fluids of infants with generalized genetic peroxisomal disorders such as Zellweger syndrome neonatal adrenoleukodystrophy.

Palmitoyl CoA lithium (Palmitoyl coenzyme A lithium) is a major component of fatty acids involved in the carnitine shuttle system, beta-oxidation, and the tricarboxylic acid cycle, and can be used to study metabolic disorders in the body.