Complement factor D-IN-1 is an effective and selective small-molecule reversible factor d inhibitor (IC50s: 0.006 and 0.05 μM in FD Thioesterolytic Fluorescent Assay and a MAC Deposition Assay, respectively).

Complement factor D-IN-2 is an inhibitor of Complement factor D and reduces the excessive activation of complement factor D.

Pelecopan (BCX9930) is a potent, selective, orally active inhibitor of complement factor D (IC50= 14.3 nM). Pelecopan can prevent both intravascular and extravascular hemolysis in PNH.

Lampalizumab (RG 7417), a humanized monoclonal antibody, selectively inhibits complement Factor D in the alternative complement pathway by binding to an exosite and sterically hindering Factor B's access to the active site. It is employed in the study of age-related macular degeneration (AMD) [1] [2].

FD-IN-1 is a factor D (FD) inhibitor with an IC50 of 12 nM.FD-IN-1 also inhibits factor XIa (FXIa) and Tryptase β2 with IC50s of 7.7 and 6.5μM, respectively. Complement FD, a highly specific S1 serine protease, plays a central role in the alternative complement pathway of the innate immune system.

Danicopan (ACH-4471) (ACH-4471) is a selective, orally active small molecule factor D inhibitor with high binding affinity to human factor D, with a Kd value of 0.54 nM. Danicopan (ACH-4471) inhibits the activity of the complement replacement pathway (APC) and may block the complement replacement pathway in paroxysmal nocturnal hemoglobinuria (PNH) and atypical hemolytic uremic syndrome (aHUS).

Factor D inhibitor 6 is a potent, highly selective, orally active compound that specifically inhibits the activity of factor D (FD). It demonstrates an IC50 of 30 nM and a Kd of 6 nM. Notably, Factor D inhibitor 6 does not exhibit any inhibitory effects against factor B, classical and lectin complement-pathway activation, nor does it interfere with a broad array of receptors, ion channels, kinases, and proteases.

Vemircopan is a complement factor D inhibitor.

N-((Allyloxy)carbonyl)-N-methyl-L-alanine, an alanine derivative, serves as a precursor for the synthesis of complement factor D inhibitors, which are key in researching immune system-related diseases [1].