neoarsphenamine
/ˌniːəʊɑːsˈfɛnəmiːn/ /ˌniːəʊɑːsˈfɛnəmɪn/Pharmacology
noun
The sodium salt of a sulphated arsphenamine derivative, C13H13As2N2NaO4S, a toxic yellow compound used to treat bacterial infections (formerly especially syphilis, now only in veterinary medicine).
Origin
Early 20th century; earliest use found in Public Health Report. From neo- + arsphenamine.