Morphine-N-oxide

Morphine-N-oxide
IUPAC name (4R,4aR,7S,7aR,12bS)-3-Methyl-2,3,4,4a,7,7a-hexahydro-1H-4,12-methano[1]benzofuro[3,2-e]isoquinoline-7,9-diol 3-oxide[citation needed]
Identifiers
CAS number	639-46-3 Y
PubChem	5362459
ChemSpider	4515047 Y
EC number	211-355-8
KEGG	C11786 Y
Jmol-3D images	Image 1 Image 2
SMILES CN1(=O)CC[C@@]23[C@H]4Oc5c2c(C[C@@H]1[C@@H]3C=C[C@@H]4O)ccc5O CN1(=O)CC[C@]23[C@H]4OC5=C(O)C=CC(C[C@@H]1[C@@H]2C=C[C@@H]4O)=C35
InChI InChI=1S/C17H19NO4/c1-18(21)7-6-17-10-3-5-13(20)16(17)22-15-12(19)4-2-9(14(15)17)8-11(10)18/h2-5,10-11,13,16,19-20H,6-8H2,1H3/t10-,11+,13-,16-,17-,18?/m0/s1 Y Key: AMAPEXTUMXQULJ-APQDOHRLSA-N Y
Properties
Molecular formula	C17H19NO4
Molar mass	301.34 g mol−1
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Morphine-N-oxide (genomorphine) is an active opioid metabolite of morphine. Morphine itself, in trials with rats, acts 11–22 times more potent than morphine-N-oxide subcutaneously and 39–89 times more potent intraperitoneally. However, pretreatment with amiphenazole or tacrine increases the potency of morphine-N-oxide in relation to morphine (intraperitoneally more so than in subcutaneous administration). A possible explanation is that morphine-N-oxide is rapidly inactivated in the liver and impairment of inactivation processes or enzymes increases functionality.

Morphine-N-oxide can also form as a decomposition product of morphine outside the body and may show up in assays of opium and poppy straw concentrate. Codeine and the semi-synthetics such as diamorphine, dihydrocodeine, dihydromorphine, hydromorphone, and hydrocodone also have equivalent amine oxide derivatives.

See also

• Codeine-N-oxide
• Morphine-6-glucuronide
• Morphine-3-glucuronide