Nitro blue tetrazolium chloride (NBT) is a NADPH-diaphorase substrate that competitively inhibits nitric oxide synthase (IC50 = 3-4 M). A well-known scavenger of superoxide anions.Nitro blue tetrazolium chloride, a substrate for dehydrogenases, is used with the alkaline phosphatase substrate BCIP in western blotting and immunohistological staining procedures.

GW274150 (dihydrochloride) is a potent, selective inhibitor of human and rat inducible nitric oxide synthase (iNOS), exhibiting oral activity and NADPH-dependence with an IC50 of 2.19 μM and Kd of 40 nM for human iNOS, and an ED50 of 1.15 μM for rat iNOS. It demonstrates reduced effectiveness against endothelial NOS (eNOS) and neuronal NOS (nNOS) in both species. The compound has been shown to confer protective effects in acute lung injury inflammation models [1] [2] [3].

Methylene Blue trihydrate (Basic blue 9) is a compound consisting of dark green crystals or crystalline powder, having a bronze-like luster. Solutions in water or alcohol have a deep blue color. Methylene Blue trihydrate is used as a bacteriologic stain and as an indicator. It inhibits soluble guanylyl cyclase and has been used to treat cyanide poisoning and to lower levels of methemoglobin. It also inhibits tau filament formation (IC50: 1.9μM).

Eupatolide is isolated from the flowers of Inula japonica with anti-inflammatory activity. Eupatolide can be used in studies about TRAIL resistance in breast cancer cells.

Aminoguanidine hydrochloride (Hydrazinecarboximidamide) is a diamine oxidase and NO synthase inhibitor, used in the treatment of diabetic nephropathy.