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The commonly shown structure for arsphenamine (salvarsan) is 1a. Arsphenamine is now known to be a mixture of compounds with the formula 1b, in which n varies from 1 to 7. The predominant values are n = 1 and n = 3. Neosalvarsan (2a) was designed to increase the solubility [18]. Oxphenarsine 3 is the expected active metabolite of arspehamine [24].
