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|Appearance:||Colorless Liquid||MOQ:||1 L|
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raw materials for pharmaceutical products
GBL Gamma-Butyrolactone / GBL Pharmaceutical Intermediates Colorless Liquid
GBL γ-Butyrolactone is a hygroscopic colorless liquid with a weak characteristic odor. Soluble in water, GBL is a common solvent and reagent in chemistry as well as being used as a flavouring, as a cleaning solvent, as a superglue remover, and as a solvent in some wet aluminium electrolytic capacitors. In humans it acts as a prodrug for γ-hydroxybutyric acid (GHB), and it is used as a recreational intoxicant with effects similar to alcohol.
Due to its property of being a prodrug of GHB which increases sleep related growth hormone (GH) secretion, GBL was sold as a nutritional supplement after the scheduling of GHB, under the names Revivarant and Renewtrient in the U.S. at least until the end of 1999.
GBL is a prodrug of GHB and its recreational use comes entirely as a result of this. To bypass GHB restriction laws, home synthesis kits were introduced to transform GBL and/or 1,4-B into GHB.
GBL overdose can cause irrational behaviour, severe sickness, coma and death.GBL has a distinctive taste and odour, described as being comparable to stale water, synthetic melon aroma or burnt plastic. This differs significantly from GHB, which is described as having a decidedly "salty" taste.
If taken undiluted by mouth, GBL can cause esophageal and gastro-intestinal irritation. It is possible for oral ingestion of GBL to cause nausea and other similar problems, possibly more so than with GHB.
GHB has biphasic effects, a euphoric effect at low doses (the reason for the term liquid ecstasy), and a sedative effectat higher doses. As a result of this sedation it can cause unconsciousness.When combined with alcohol the increased sedation and risk of vomiting results in a high risk of fatality. Many harm reduction organisations suggest never mixing the two drugs as a result.
There have been news reports of several deaths associated with GBL, usually in combination with alcohol or other depressants.
Frequent use of GHB/GBL, even when taken long-term and in moderate doses, does not appear to cause significant physical dependency in the majority of its users. In many people, quitting or temporarily abstaining from use of the drugs is achieved with minimal or no difficulty.
However, when consumed in excessive amounts with a high frequency of dosing, physical and psychological dependence can develop.
There are some reports of GHB/GBL users adopting a '24/7' dosing regime. This is where the user has become tolerant to the effects of the drug, increasing the dosage and frequency of dosage simply to avoid withdrawal symptoms.
For those users who do report withdrawal symptoms upon quitting the use of GHB/GBL, symptoms seem to depend on the dosage and the length of time the drug was used for. Light to moderate users often experience insomnia and sleep-related problems, whereas heavy, prolonged use can cause severe withdrawal symptoms similar to Benzodiazepine withdrawal syndrome (BWS).
A milliliter of pure GBL metabolizes to the equivalent 1.65g of NaGHB, the common form, so doses are measured in the single milliliter range, either taken all at once or sipped over the course of a night.
GBL, butyrolactone, 1,4-lactone, 4-butyrolactone, 4-hydroxybutyric acid lactone, gamma-hydroxybutyric acid lactone, and oxolan-2-one
|Molar mass||86.09 g·mol−1|
|Density||1.1286 g/mL (15 °C), 1.1296 g/mL (20 °C)|
|Melting point||−43.53 °C (−46.35 °F; 229.62 K)|
|Boiling point||204 °C (399 °F; 477 K)|
Solubility in water
|Solubility||soluble in CCl4, methanol, ethanol, acetone, benzene, ethyl ether|
Refractive index (nD)
|1.435, 1.4341 (20 °C)|
|Viscosity||1.7 cp (25 °C)|
|Flash point||98 °C (208 °F; 371 K) (closed cup)|
|LD50 (median dose)||17.2 mL/kg (orally, rat)|
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