MDMB-4en-PINACA (also incorrectly known as 5-CL-ADB-A) is an indazole-based synthetic cannabinoid that has been sold online as a designer drug. MDMB-4en-PINACA differs from 5F-MDMB-PINACA due to replacement of 5-fluoropentyl with a pent-4-ene moiety (4-en). It acts as a potent agonist of the CB1 receptor with an EC50 value of 2.47 nM.
Sweden’s public health agency suggested classifying MDMB-4en-PINACA as a hazardous substance, on December 18, 2019.
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