{"brand":"Compound Laws","url":"https://compoundlaws.com/compounds/endomorphin-1/oklahoma/","compound":{"slug":"endomorphin_1","name":"Endomorphin-1","same_as":"https://en.wikipedia.org/wiki/Endomorphin"},"jurisdiction":{"code":"OK","name":"Oklahoma"},"as_of":"2026-07-18","answer":"As of July 18, 2026, Endomorphin-1 is legal to sell at retail in Oklahoma. Unscheduled - legal as research-use-only; no operative instrument reaches a structurally-dissimilar opioid peptide. Controlling source: 63 O.S. 2-101 (synthetic controlled substance; offense 2-401).","forms":[{"form":"all","label":"All forms","status":"legal","state_status":null,"federal_overlay":false,"headline":"Unscheduled - legal as research-use-only; no operative instrument reaches a structurally-dissimilar opioid peptide","rule_type":"permanent","tier":"unscheduled","schedule_class":null,"limit":null,"effective_date":null,"verified_at":"2026-07-18","confidence":"confirmed","verbatim_excerpt":"63 O.S. 2-101 (para. 48): \"'Synthetic controlled substance' means a substance: (1) the chemical structure of which is substantially similar to the chemical structure of a controlled dangerous substance in Schedule I or II, AND (2) which has a stimulant, depressant, or hallucinogenic effect on the central nervous system that is substantially similar to or greater than ...; or (3) ... which such person represents or intends ...\" Excludes CDS / approved-new-drug / not-for-human-consumption substances. [Conjunctive - structure prong fails.]","excerpt_source_url":"https://www.oscn.net/applications/oscn/DeliverDocument.asp?CiteID=437011","citations":[{"title":"63 O.S. 2-101 (synthetic controlled substance; offense 2-401)","url":"https://law.justia.com/codes/oklahoma/title-63/section-63-2-101/","pinpoint":null,"publisher":"Code mirror","type":"statute","primary":true,"official":true},{"title":"63 O.S. 2-101 (opiate def)","url":"https://law.justia.com/codes/oklahoma/title-63/section-63-2-401/","pinpoint":null,"publisher":"Code mirror","type":"statute","primary":false,"official":true}],"history":[]}],"neighbors":[{"code":"AR","status":"legal"},{"code":"CO","status":"legal"},{"code":"KS","status":"legal"},{"code":"MO","status":"legal"},{"code":"NM","status":"legal"},{"code":"TX","status":"legal"}],"laws":[{"citation":"63 O.S. § 2-204(C) (Schedule I hallucinogens — enumerated, 4-HO-MET absent); 63 O.S. § 2-101 (synthetic controlled substance / analog definition)","title":null,"official_url":"https://law.justia.com/codes/oklahoma/2025/title-63/section-63-2-204/","source_label":"MIRROR","effective_date":null,"retrieved_date":"2026-06-19","text_hash":"a353076997f770393d0c805c139b2010263d3d016c63f859f86e9a75da91079b"},{"citation":"63 O.S. 2-204 (Schedule I)","title":"63 O.S. 2-204 (Schedule I)","official_url":"https://www.oklegislature.gov/OK_Statutes/CompleteTitles/os63.pdf","source_label":"OFFICIAL","effective_date":null,"retrieved_date":"2026-10-08","text_hash":"1cf3a1fb010cfd199ca876326d010e8aab6dba1065da097a7737182eec48569a"},{"citation":"63 O.S. Sec. 2-101(48) (synthetic controlled substance) with operative offense at 63 O.S. Sec. 2-401(C)(1)","title":"Definition of synthetic controlled substance; prohibited acts (manufacture/distribute)","official_url":"https://www.oscn.net/applications/oscn/DeliverDocument.asp?citeid=437011","source_label":"MIRROR","effective_date":null,"retrieved_date":"2026-07-20","text_hash":"999f43dfd4f3910ba9c983f17faf6d29d17843897e5f66eec0f25f59f1eee23d"}]}