What is "n-phenethylnordesomorphine"

N-Phenethylnordesomorphine is an opiate analgesic drug derived from desomorphine by replacing the N-methyl group with β-phenethyl. Since desomorphine is already around eight times more potent than morphine, the additional boost in binding affinity produced by using the larger phenethyl group makes N-phenethylnordesomorphine a highly potent analgesic drug, some 85x more potent than morphine, and a similar strength to the closely related morphinan derivative phenomorphan.