Dequalinium is a quaternary ammonium cation and bolaamphiphile commonly available as the dichloride salt. The bromide, iodide, acetate, and undecenoate salts are known as well.
Atorvastatin acetonide tert-butyl ester, a valuable pharmaceutical intermediate, is used in preparing Atorvastatin salts, an HMG-CoA reductase inhibitor.
Decamethyltetrasiloxane, a non-cyclic silicone oligomer, is used in the methylation of mercury(II) salts. It is transformed by a specific microflora. In the natural environment, it is degraded by mechanisms similar to other organic compounds.
Benzylpenicillin is a penicillin derivative commonly used in the form of its sodium or potassium salts in the treatment of a variety of infections. It is effective against most gram-positive bacteria and against gram-negative cocci.