Ambergris
From Memory Alpha, the free Star Trek reference.
Ambergris is an intestinal concretion made by Earth sperm whales, once used to stabilize the scent of perfumes.
Dr. McCoy noted that the poisonous venom of the sur-snake, a sea-creature native to the planet Argo, was similar to the ambergris of Earth whales. (TAS: "The Ambergris Element")
