What is "arsphenamine"

n. (context pharmaceutical drug organic compound English) A phenolic amine derivative of arsenic that was used to treat syphilis (under the trade name of Salvarsan).

Arsphenamine, also known as Salvarsan or compound 606, is a drug that was introduced at the beginning of the 1910s as the first effective treatment for syphilis, and was also used to treat trypanosomiasis. This organoarsenic compound was the first modern chemotherapeutic agent.