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Cantharidin is the active principle of a species of beetle of which the Spanish fly, Cantharis vesicatoria, is probably the best known. The Russian and Chinese species, Mylabris cichorii and M. phalerata, contain the same principle. Cantharidin is the anhydride of the unstable cantharidic acid and has the formula C,oH1204; it occurs
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Nickolls et al. (1954) studied this question.
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