Dimethyl sulfate is a diester of methanol and sulfuric acid. Dimethyl sulfate is commonly used as a reagent for the methylation of phenols, amines, and thiols. Dimethyl sulfate is a potent genotoxic chemical. It can directly alkylate DNA both in vitro and in vivo. It have been shown to induce mutations, chromosomal aberrations, and other genetic alterations in a diversity of organisms. Dimethyl sulfate can cause severe burns to the skin, eyes, and respiratory tract. Systemic effects of dimethyl sulfate include damage to the liver and kidneys.

Dimethyl ether in combination with propane was approved to use in home conditions for the cryotherapy to treat warts. Nevertheless, this cold spray has to be used very careful not to damage unaffected areas of the skin.

Dimethyl carbate is an organic compound used in the form of mixtures with other chemicals as a repellent for blood-sucking insects such as mosquitoes.

Dimethyl phthalate, an organic compound, is used as repellents. This compound is a pollutant that is very harmful to organisms due to its mutagenicity, teratogenicity and carcinogenicity. It was discovered, that dimethyl phthalate could alter the biological function of the one of the most important bacteria in the environment, P. fluorescens.

Calcium Fumarate is a calcium salt of fumaric acid, it can be used as a food supplement. Calcium Fumarate may be used to treat conditions caused by low Calcium levels such as bone loss (osteoporosis), weak bones (osteomalacia/rickets), decreased activity of the parathyroid gland (hypoparathyroidism), and a certain muscle disease (latent tetany). It may also be used in certain patients to make sure they are getting enough Calcium (e.g., women who are pregnant, nursing, or postmenopausal, people taking certain medications such as phenytoin, phenobarbital, or prednisone). Calcium Fumarate is classified by the FDA as a dietary and nutritional additive (21CFR§172.350) and has been used for many years.