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The mixture of heroin, fentanyl, carfentanil and the synthetic opioid U-47700 gets its name from its resemblance to concrete mixing powder. June 03—A potent opioid that is suspected as the cause of at least 47 overdose deaths in Illinois, Ohio and Pennsylvania, appears to be resistant to Narcan, health officials are reporting. Known as acrylfentanyl, the drug has not been included on the Drug En…