6β-naltrexol-d4 6β-naltrexol-d4 6β-naltrexol-d4, also known as 6β-hydroxynaltrexone-d4, is a deuterium-labeled form of 6β-naltrexol used for nmr imaging. unlike opioid inverse agonists such as naloxone and naltrexone (which are often dubbed "antagonists" for simplicity's sake), 6β-naltrexol and 6β-naltrexol-d4 are opioid neutral antagonists. 6β-naltrexol-d4clinical dataatc codenoneidentifiers iupac name (1s,5r,13r,14r,17s)-4-(cyclopropylmethyl)(13,14,15,15-2h4)-12-oxa-4-azapentacyclooctadeca-7(18),8,10-triene-10,14,17-triol cas number1279034-32-0pubchem cid46782432chemspider58783513chemical and physical dataformulac20h21d4no4molar mass347.445 g·mol−13d model (jsmol)interactive image smiles o1(c(c2(o)3cc4ccc(o)c5o1(2(ccn3cc6cc6)c45))()) inchi inchi=1s/c20h25no4/c22-13-4-3-12-9-15-20(24)6-5-14(23)18-19(20,16(12)17(13)25-18)7-8-21(15)10-11-1-2-11/h3-4,11,14-15,18,22-24h,1-2,5-10h2/t14-,15-,18+,19+,20-/m1/s1/i5d2,14d,18dkey:jlvnehkorqfvqj-ncrvcfhnsa-n