PFB-FDGlu is a lysosomal Glucocerebrosidase (GCase) substrate with cell-permeable specificity that is cleaved to produce fluorescein.

Monoethyl malonic acid belongs to the class of organic compounds known as dicarboxylic acids and derivatives. These are organic compounds containing exactly two carboxylic acid groups. Monoethyl malonic acid exists as a solid soluble (in water) and a weakly acidic compound (based on its pKa).

Copper peptide GHK-Cu is a naturally occurring copper complex of the tripeptide glycyl-L-histidyl-L-lysine. The tripeptide has strong affinity for copper(II) and was first isolated from human plasma. It can be found also in saliva and urine.