In this task, you are given a sentence in the English language. Your job is to translate the English sentence into the Spanish language.

Which of the following opioid drugs is NOT considered a pure agonist ?

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
¿Cuál de los siguientes fármacos opioides NO se considera un agonista puro?