7α, 25-dihydroxycholesterol (7α,25-OHC) is a potent and selective agonist and endogenous ligand of the orphan GPCR receptor EBI2 (GPR183). 7α, 25-dihydroxycholesterol can serve as a chemokine directing migration of B cells, T cells and dendritic cells[1][2], and it is highly potent at activating EBI2 (EC50=140 pM; Kd=450 pM).

2'-O-Methyladenosine, a methylated adenine residue is found in the urine of normals and adenosine deaminase deficient patients. It shows unique hypotensive activities.

L-Histidinol dihydrochloride is a precursor of histamine and a reversible inhibitor of protein synthesis.