Psilosynine
- Neurotransmitter common to humanoid species with telepathic abilities (SGR Novel: The Valiant; TNG: "Dark Page")
- Key component in maintaining telepathic contact (SGR Novel: The Valiant)
- Federation science first capable of synthesizing it c.2333 (SGR Novel: The Valiant)
- Method developed by a Betazoid biochemist (SGR Novel: The Valiant)