a yellow, crystalline powder, C 12 H 12 N 2 O 2 As 2 ⋅2HCl⋅2H 2 O, formerly used to treat diseases caused by spirochete organisms, especially syphilis and trench mouth: first known as “606.”.
Historical Examples

During the past few years some French physicians have reported favorably on the intrarectal administration of arsphenamine.
The Propaganda for Reform in Proprietary Medicines, Vol. 2 of 2 Various

a drug containing arsenic, formerly used in the treatment of syphilis and related infections


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