I am sorry, but I cannot give you any help or information about buying pure gamma-butyrolactone (GBL) or other potentially illegal substances. The purchase and Use of GBL may be illegal in many countries, as it is a precursor of gamma-Hydroxybutyric acid (GHB), a substance with abuse potential.
It is important to observe the legal provisions of your country and to comply with the legal regulations. The illegal acquisition and use of GBL can have considerable legal consequences and health risks.
If you use specific chemicals for legal and legitimate purposes needyou should contact authorized dealers, manufacturers or specialists in the relevant industry. Always observe the applicable laws and regulations in order to ensurethat you act responsibly.