Dioxaphetyl butyrate

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Dioxaphetyl butyrate
Clinical data
Routes of
Oral, Other ROA Unknown
ATC code
  • none
Legal status
Legal status
Synonyms Amidalgon, Spasmoxal
CAS Number
PubChem CID
ECHA InfoCard 100.006.731
Chemical and physical data
Formula C22H27NO3
Molar mass 353.45 g/mol
3D model (Jmol)
 NYesY (what is this?)  (verify)

Dioxaphetyl butyrate (INN; trade names Amidalgon, Spasmoxal) is an opioid analgesic which is a diphenylacetic acid derivative, related to other open-chain opioid drugs such as dextropropoxyphene, levacetylmethadol (LAAM), lefetamine and dimenoxadol.

It produces similar effects to other opioids, including dependence, euphoria, analgesia, sedation, constipation, dizziness and nausea.

In the United States it is a Schedule I Narcotic controlled substance with an ACSCN of 9621 and a 2013 annual aggregrate manufacturing quota of zero.