L-Cysteine hydrochloride hydrate is a conditionally essential amino acid, which acts as a precursor for biologically active molecules such as hydrogen sulphide (H2S), glutathione and taurine.

Visomitin (SKQ1 bromide, PDTP) is a mitochondria-targeted antioxidant that decreases transmembrane potential and production of reactive oxygen species (ROS).

SR4554 is a fluorinated 2-nitroimidazole non-invasive tumor hypoxia probe for the detection of tumor hypoxia as detected by 19F magnetic resonance spectroscopy (MRS).