Acetalin-3 (Ac-RFMWMT-NH2), a hexapeptide, is a μ opioid receptor antagonist with high affinity for μ and κ3 opioid receptor, weak affinity for κ1 receptors and no affinity for κ2 receptors.

13-Dehydroxyindaconitine is a natural alkaloid with antioxidant activity.

Lidocaine N-ethyl bromide is a blocker of non-membrane-permeable,and Inhibits Acid-Induced Activation of Esophageal Nociceptive C Fiber Neurons.