{"abstract":"With the issuance of this final rule, the Drug Enforcement Administration places methyl 3,3-dimethyl-2-(1-(pent-4-en-1-yl)-1H- indazole-3-carboxamido)butanoate (other name: MDMB-4en-PINACA), including its salts, isomers, and salts of isomers whenever the existence of such salts, isomers, and salts of isomers is possible, in schedule I of the Controlled Substances Act. This action is being taken, in part, to enable the United States to meet its obligations under the 1971 Convention on Psychotropic Substances. This action imposes regulatory controls and administrative, civil, and criminal sanctions applicable to schedule I controlled substances on persons who handle (manufacture, distribute, reverse distribute, import, export, engage in research, conduct instructional activities or chemical analysis with, or possess) or propose to handle MDMB-4en-PINACA.","action":"Final rule.","agencies":[{"raw_name":"DEPARTMENT OF JUSTICE","name":"Justice Department","id":268,"url":"https://www.federalregister.gov/agencies/justice-department","json_url":"https://www.federalregister.gov/api/v1/agencies/268","parent_id":null,"slug":"justice-department"},{"raw_name":"Drug Enforcement Administration","name":"Drug Enforcement Administration","id":116,"url":"https://www.federalregister.gov/agencies/drug-enforcement-administration","json_url":"https://www.federalregister.gov/api/v1/agencies/116","parent_id":268,"slug":"drug-enforcement-administration"}],"body_html_url":"https://www.federalregister.gov/documents/full_text/html/2026/04/24/2026-08104.html","cfr_references":[{"chapter":null,"citation_url":null,"part":"1308","title":21}],"citation":"91 FR 21958","comment_url":null,"comments_close_on":null,"correction_of":null,"corrections":[],"dates":"Effective April 27, 2026.","disposition_notes":null,"docket_ids":["Docket No. DEA-1356"],"dockets":[{"supporting_documents":[{"title":"Controlled Substances Ordering System Modernization","document_id":"DEA_FRDOC_0001-0420"},{"title":"Samidorphan_DEA_8F analysis_10-15-2020","document_id":"DEA_FRDOC_0001-0330"},{"title":"HHS Samidorphan 2020 01-09","document_id":"DEA_FRDOC_0001-0329"}],"agency_name":"DEA","documents":[{"comment_count":0,"comment_start_date":"2026-04-24","updated_at":"2026-04-24T12:04:51.484-04:00","comment_url":"https://www.regulations.gov/commenton/DEA_FRDOC_0001-0514","allow_late_comments":false,"id":"DEA_FRDOC_0001-0514","comment_end_date":null,"regulations_dot_gov_open_for_comment":false}],"supporting_documents_count":2,"id":"DEA_FRDOC_0001","title":"Recently Posted DEA Rules and Notices"}],"document_number":"2026-08104","effective_on":"2026-04-27","end_page":21963,"executive_order_notes":null,"executive_order_number":null,"explanation":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2026/04/24/2026-08104.xml","html_url":"https://www.federalregister.gov/documents/2026/04/24/2026-08104/schedules-of-controlled-substances-placement-of-mdmb-4en-pinaca-in-schedule-i","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/2026-08104?publication_date=2026-04-24","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2026-04-24/2026-08104/mods.xml","not_received_for_publication":null,"page_length":6,"page_views":{"count":122,"last_updated":"2026-04-24 18:15:03 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2026-04-24/pdf/2026-08104.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2026-08104.pdf?1776948327","publication_date":"2026-04-24","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2026/04/24/2026-08104.txt","regulation_id_number_info":{},"regulation_id_numbers":[],"regulations_dot_gov_info":{"supporting_documents":[{"title":"Controlled Substances Ordering System Modernization","document_id":"DEA_FRDOC_0001-0420"},{"title":"Samidorphan_DEA_8F analysis_10-15-2020","document_id":"DEA_FRDOC_0001-0330"},{"title":"HHS Samidorphan 2020 01-09","document_id":"DEA_FRDOC_0001-0329"}],"comments_count":0,"agency_id":"DEA","comments_url":"https://www.regulations.gov/docketBrowser?rpp=50&so=DESC&sb=postedDate&po=0&dct=PS&D=DEA_FRDOC_0001","supporting_documents_count":2,"docket_id":"DEA_FRDOC_0001","document_id":"DEA_FRDOC_0001-0514","regulation_id_number":null,"title":"Recently Posted DEA Rules and Notices","checked_regulationsdotgov_at":"2026-04-24T22:55:03Z"},"regulations_dot_gov_url":null,"significant":null,"signing_date":null,"start_page":21958,"subtype":null,"title":"Schedules of Controlled Substances: Placement of MDMB-4en-PINACA in Schedule I","toc_doc":"Placement of MDMB-4en-PINACA in Schedule I","toc_subject":"Schedules of Controlled Substances","topics":["Administrative practice and procedure","Drug traffic control","Reporting and recordkeeping requirements"],"type":"Rule","volume":91}