Fluorescein isothiocyanate (FITC) is widely used to attach a fluorescent label to proteins via the amine group. The isothiocyanate group reacts with amino terminal and primary amines in proteins. It has been used for the labeling of proteins including antibodies and lectins. Isomer I (Fluorescein 5-isothiocyanate) has the thiocyanate group on the 4 carbon of the benzene ring, whereas isomer II (Fluorescein 6-isothiocyanate) has the thiocyanate on the 5 carbon. The two isomers are indistinguishable spectrally, either by wavelength or intensity. Isomer I is more easily isolated in pure form, so is less expensive. This may explain why isomer I is more commonly used for labeling. For many purposes, however, the mixed isomers of FITC will be perfectly suitable. Some FITC conjugates are being investigated for diagnostic purposes. Folate-fluorescein isothiocyanate, or folate-FITC, also identified as EC-17, targets folate receptors over expressed in certain cancers and could help in better identifying the margins of the cancer thereby achieving negative margins.

Aurodox is an antibiotic obtained from a streptomyces variant considered as possibly effective against streptococcus pyogenes infections. It may promote growth in poultry. Aurodox inhibits protein biosynthesis by binding to elongation factor Tu (EF-Tu). Aurodox has being shown to possess the ability to inhibit the secretion of type III-secreted proteins without affecting bacterial growth.

Propylnorapomorphine is a potent and selective D2 receptor agonist. Propylnorapomorphine is used as a tool compound to label dopamine receptors in rodent brain, and elicits dopaminergic behavioural effects. It stimulates motor activity, induces stereotypic behaviour and sexual stimulation. Propylnorapomorphine was investigated in clinical trial against Parkinson's disease and schizophrenia

gamma-sitosterol is a naturally occurring plant steroid isolatable from plants of the genus Lagerstroemia. Gamma-sitosterol is a potent inhibitor of the complement component C1 complex, and it has demonstrated potential as a diabetic treatment in rats. Gamma-sitosterol is a stereoisomer of beta-sitosterol, which sees wide use as an over the counter natural supplement. However, plant extracts containing gamma-sitosterol have demonstrated toxicity on in-vitro human cell assays; which may discourage use as a natural supplement.

Fluorescein isothiocyanate (FITC) is widely used to attach a fluorescent label to proteins via the amine group. The isothiocyanate group reacts with amino terminal and primary amines in proteins. It has been used for the labeling of proteins including antibodies and lectins. Isomer I (Fluorescein 5-isothiocyanate) has the thiocyanate group on the 4 carbon of the benzene ring, whereas isomer II (Fluorescein 6-isothiocyanate) has the thiocyanate on the 5 carbon. The two isomers are indistinguishable spectrally, either by wavelength or intensity. Isomer I is more easily isolated in pure form, so is less expensive. This may explain why isomer I is more commonly used for labeling. For many purposes, however, the mixed isomers of FITC will be perfectly suitable.