# Schedules of Controlled Substances: Placement of cyclopentyl fentanyl, isobutyryl fentanyl, para-chloroisobutyryl fentanyl, para-methoxybutyryl fentanyl, and valeryl fentanyl Into Schedule I
> **Proposed Rule** · Notice of proposed rulemaking. · Published 2020-01-30 · 85 FR 5356
## Document
- **Document number:** 2020-01681
- **Category:** scheduling
- **Type:** Proposed Rule
- **Action:** Notice of proposed rulemaking.
- **Citation:** 85 FR 5356
- **Publication date:** 2020-01-30
## Abstract

The Drug Enforcement Administration proposes placing 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. If finalized, this action would make permanent the existing 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, or possess), or propose to handle cyclopentyl fentanyl, isobutyryl fentanyl, para-chloroisobutyryl fentanyl, para- methoxybutyryl fentanyl, and valeryl fentanyl.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2020/01/30/2020-01681/schedules-of-controlled-substances-placement-of-cyclopentyl-fentanyl-isobutyryl-fentanyl)
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