dioxaphetyl butyrate dioxaphetyl butyrate 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. dioxaphetyl butyrateclinical dataother namesamidalgon, spasmoxalroutes ofadministrationoral, other roa unknownatc codenonelegal statuslegal status au: s9 (prohibited substance) ca: schedule i de: anlage i (authorized scientific use only) us: schedule i identifiers iupac name ethyl 4-morpholin-4-yl-2,2-di(phenyl)butanoate cas number467-86-7 ypubchem cid48194chemspider43838 nuniig751h98fy4comptox dashboard (epa)dtxsid20196914 echa infocard100.006.731 chemical and physical dataformulac22h27no3molar mass353.462 g·mol−13d model (jsmol)interactive image smiles ccoc(=o)c(ccn1ccocc1)(c1ccccc1)c1ccccc1 inchi inchi=1s/c22h27no3/c1-2-26-21(24)22(19-9-5-3-6-10-19,20-11-7-4-8-12-20)13-14-23-15-17-25-18-16-23/h3-12h,2,13-18h2,1h3 nkey:lqgixnqcoxncrp-uhfffaoysa-n n ny (what is this?) (verify) 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 aggregate manufacturing quota of zero.