[15,16-3H2]-6,14-ethenomorphinan-3-ol, 17-(cyclopropylmethyl)-4,5-epoxy-18,19-dihydro-18-(1-hydroxy-1-methylethyl)-6-methoxy-, (5alpha,6beta,14beta,18R)- [15,16-3H] Diprenorphine [3H]Diprenorphine