DAPI Dihydrochloride is a cell-permeable fluorescent probe by binding in the minor grove of A-T rich sequences of DNA, used to stain DNA and chromosomes, with a preference for adenine and thymine rich DNA.

Dimethyl Itaconate is a chemical reagent used in the synthesis of functionalized 2-isoxazolines used in fragment-based drug discovery.

Tetramethylammonium ion has limited toxicity of dermal exposure, but fatal effects can be introduced by pre-treatment with hydroxide ion.