Sphingomyelin (chicken egg) (SMs (chicken egg)) is a sphingolipid derived from eggs and is a major component of the plasma membrane.

2-Amino-2-dichlorobenzophenone is a natural compound.

D-proline is an isomer of the naturally occurring amino acid L-Proline. D-amino acids have been found in relatively high abundance in human plasma and saliva. These amino acids may be of bacterial origin but there is also evidence that they are endogenously produced through amino acid racemase activity.