PBR28 or PBR-28, a chemical substance that binds to translocator protein TSPO, also known as Peripheral-type benzodiazepine receptor (PBR). TSPO located within the cells such as macrophages reaches high levels of expression in inflammatory conditions and thus can be a biomarker of neuroinflammation. When radioactivity in the form of carbon-11 is tagged to PBR 28 and is administered, its uptake in the inflammatory body regions can be measured using positron emission tomography (PET). PBR28 now is involved in a clinical trial to evaluate the specificity of its binding in the joints of patients with inflammatory joint disease, like rheumatoid and psoriatic arthritis.

Sulfisoxazole is a sulfonamide antibacterial antibiotic. The sulfonamides are synthetic bacteriostatic antibiotics with a wide spectrum against most gram-positive and many gram-negative organisms. However, many strains of an individual species may be resistant. Sulfisoxazole acetyl in combination with erythromycin ethylsuccinate is used for treatment of ACUTE OTITIS MEDIA in children that is caused by susceptible strains of Haemophilus influenzae. Sulfisoxazole acetyl is a prodrug of sulfisoxazole. Acetyl group is added to make the drug poorly water soluble, and is hydrolyzed in vivo to the active drug. Sulfisoxazole and its acetylated metabolites are excreted primarily by the kidneys through glomerular filtration. Sulfisoxazole is a competitive inhibitor of the enzyme dihydropteroate synthetase. It inhibits bacterial synthesis of dihydrofolic acid by preventing the condensation of the pteridine with para-aminobenzoic acid (PABA), a substrate of the enzyme dihydropteroate synthetase. The inhibited reaction is necessary in these organisms for the synthesis of folic acid

Acetyltryptophan,DL- functions readily as a component of the food in place of the free amino acid - a greater amount of acetyltryptophane,DL- than dl-tryptophane may be available to man. Acetyltryptophan,DL- is used as an additive in the protein microbubbles, used in various biomedical applications such as contrast imaging, targeted drug and gene delivery, delivery of drugs through blood brain barrier (BBB) and IV O2 delivery etc. In the breast cancer biomarkers search, lower levels of endogenous metabolite Acetyltryptophan, DL- was identified in the fluid from the affected breasts compared to the control breast fluid.