arsphenamine
ars·phen·a·mine
noun \ärs-ˈfen-ə-ˌmēn, -mən\Definition of ARSPHENAMINE
: a light-yellow toxic hygroscopic powder C12Cl2H14As2N2O2·2H2O formerly used in the treatment especially of syphilis and yaws—called also salvarsan, six-o-six
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