You searched for: “anesthesiophore
anesthesiophore (s) (noun), anesthesiophores (pl)
That part of a molecule of a chemical compound that results in a loss of sensation or a hypnotic effect: The anesthesiophore is responsible for the anesthetic actions that take place in patients.

In medicine, as in statecraft and propaganda, words are sometimes the most powerful drugs we can use.

-Sara Murray Jordan, New York Times