Pulse doses of emulsions of ten polynuclear aromatic hydrocarbons were found to destroy the adrenal cortex selectively.The corticolytic hydrocarbons are derivatives of 12-methylbenz(a)anthracene which possess at position 7 an alkyl, methoxymethyl, formyl, or hydroxyalkyl group. It would appear that the active corticolytic agent is 7-hydroxyalkyl-12-methylbenz(a)anthracene, of chemical source or generated in metabolism.
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