C. N. Myers, A. G. DuMez, Some Qualitative and Quantitative Tests for Arsphenamine (3, 3′-Diamino-4, 4′-Dioxy-Arsenobenzene Dihydrochloride) and Neo-Arsphenamine (Sodium-3, 3′-Diamino-4, 4′-Dihydroxy-Arsenobenzene-Methanal-Sulphoxalate), Public Health Reports (1896-1970), Vol. 33, No. 25 (Jun. 21, 1918), pp. 1003-1018
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Myers et al. (1918) studied this question.