Structural Chemistry
Molecular Structure & GABA-Analogue Chemistry
Phenibut is structurally a γ-aminobutyric acid (GABA) analogue: it is GABA bearing a phenyl group at the β (3-) position of the carbon chain. This single structural addition is what distinguishes it, as a molecule, from the endogenous neurotransmitter GABA.
Relationship to GABA
GABA has the formula C4H9NO2 (4-aminobutanoic acid). Phenibut (C10H13NO2) is 4-amino-3-phenylbutanoic acid — the same four-carbon amino-acid backbone with a phenyl substituent at C-3. The phenyl group increases lipophilicity relative to GABA, a purely physicochemical property relevant to how the compound is handled and characterized in the laboratory.
Chirality
The C-3 position is a stereocenter, so Phenibut can exist as R- and S-enantiomers. Material supplied as a research chemical is typically the racemate unless documentation specifies otherwise.
Structural comparison with related GABA analogues
Several research compounds share a GABA-derived backbone. The comparison below is strictly structural/chemical:
- Baclofen — GABA with a 4-chlorophenyl group at the β position (a close structural relative of Phenibut).
- Pregabalin — a 3-substituted GABA analogue (3-isobutyl).
- Gabapentin — GABA with a cyclohexane ring bridging the backbone.
These are structural relationships only; this page makes no comparison of biological effects. See the chemical reference for full identifiers.
For Research Use Only. Not for human or animal consumption. Nothing on this page is medical advice, a health claim, or usage guidance. No statement here has been evaluated by the U.S. Food and Drug Administration. See our Disclaimer and Research Use Policy.