Noradrenalin is the cerebral material secreted when people are in a state of extreme tension or fear. As the Beta Hetero Nonserotonin only exists in active cells, you can't extract it from a dead brain.

Thus, the best way to extract the material is to cut open the subject's skull without using anesthesia. This will cause excessive secretion of noradrenalin. The pituitary is then ripe for immediate extraction.

Vincent Goldman, Commander
Tyrant Plant on Sheena Island