methyldihydromorphine methyldihydromorphine methyldihydromorphine is a semi-synthetic opioid originally developed in germany in 1936, controlled under both domestic law and un conventions because of its possible potential for abuse. methyldihydromorphine is related to heterocodeine and is not a synonym for dihydrocodeine or dihydroheterocodeine (6-methoxydihydromorphine). methyldihydromorphineclinical dataatc codenonelegal statuslegal status ca: schedule i de: anlage i (authorized scientific use only) us: schedule i identifiers iupac name (5α,6α)-6,17-dimethyl-4,5-epoxymorphinan-3,6-diol cas number509-56-8 ypubchem cid5464303chemspider4576611 nunii26ay9tlo5wcomptox dashboard (epa)dtxsid20228067 chemical and physical dataformulac18h23no3molar mass301.386 g·mol−13d model (jsmol)interactive image smiles c1(cc23cc4ccc(c5c42(1o5)ccn3c)o)o inchi inchi=1s/c18h23no3/c1-17(21)6-5-11-12-9-10-3-4-13(20)15-14(10)18(11,16(17)22-15)7-8-19(12)2/h3-4,11-12,16,20-21h,5-9h2,1-2h3/t11-,12+,16-,17-,18-/m0/s1 nkey:nbkvwijqjmeqle-ngtwoadlsa-n n ny (what is this?) (verify) this compound is a derivative of hydromorphone it has been found to be 33 percent the analgesic potency of morphine with a substantially longer duration of action. so far, little is currently known about this compound. it is a schedule i controlled substance in the united states with an acscn of 9304 and a 2013 annual manufacturing quota of 2 grams.