Salvarsan has long been assumed to have an As=As double bond, akin to the N=N linkage in azobenzene. However, in 2005, in an extensive mass spectrometric analysis, the<unk> senic–arsenic bonds in Salvarsan were shown to be single bonds rather than double bonds. Presumed to consist of RAs=AsR molecules, i.e. (RAs)2, Salvarsan was found to actually contain a mixture of cyclo-(RAs)3 and cyclo-(RAs)5 species, where R is the 3-amino-4-hydroxyphenyl moiety. According to Nicholson, these cyclic species slowly release an oxidised species, RAs(OH)2, that is likely responsible for Salvarsan's antisyphilis properties.
Arsphenamine
Suvorexant
Veristrat
Adatanserin
Influenzanet
Daridorexant
Patiromer
Blonanserin