2-Methyltetrahydrofuran-3-one also known as fema 3373 or tetrahydro-2-methyl-3-furanone belongs to the class of organic compounds known as furanones.

Diaminopimelic acid or DAPA is a lysine-like amino acid derivative that is a key component of the bacterial cell wall. DAPA is incorporated or integrated into peptidoglycan of gram negative bacteria and is the attachment point for Braun's lipoprotein (BLP or Murein Lipoprotein). BLP is found in gram-negative cell walls and is one of the most abundant membrane proteins.

Creatinine is a break-down product of creatine phosphate in muscle, and is usually produced at a fairly constant rate by the body.