Schedules of Controlled Substances: Placement of cyclopentyl fentanyl, isobutyryl fentanyl, para-chloroisobutyryl fentanyl, para-methoxybutyryl fentanyl, and valeryl fentanyl in Schedule I

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The Drug Enforcement Administration places cyclopentyl fentanyl (N-(1-phenethylpiperidin-4-yl)-N- phenylcyclopentanecarboxamide), isobutyryl fentanyl (N-(1- phenethylpiperidin-4-yl)-N-phenylisobutyramide), para-chloroisobutyryl fentanyl (N-(4-chlorophenyl)-N-(1-phenethylpiperidin-4- yl)isobutyramide), para-methoxybutyryl fentanyl (N-(4-methoxyphenyl)-N- (1-phenethylpiperidin-4-yl)butyramide), and valeryl fentanyl (N-(1- phenethylpiperidin-4-yl)-N-phenylpentanamide), including their isomers, esters, ethers, salts, and salts of isomers, esters, and ethers whenever the existence of such isomers, esters, ethers, and salts is possible, in schedule I of the Controlled Substances Act. This action continues the imposition of the regulatory controls and administrative, civil, and criminal sanctions applicable to schedule I controlled substances on persons who handle (manufacture, distribute, import, export, engage in research, conduct instructional activities or chemical analysis with, or possess), or propose to handle cyclopentyl fentanyl, isobutyryl fentanyl, para-chloroisobutyryl fentanyl, para- methoxybutyryl fentanyl, and valeryl fentanyl.