butyrolactones 

It seems like there might be a slight confusion in the term. "Butyrolactones" generally refers to a class of organic compounds that includes gamma-butyrolactone (GBL). GBL is a colorless, clear liquid with a sweet taste and odor. It is a cyclic ester of gamma-hydroxybutyric acid (GHB).

As mentioned before, GBL is commonly used as an industrial solvent and has various applications. However, it's crucial to note that the unauthorized purchase, sale, or use of GBL, especially for recreational purposes, can have serious legal consequences and health risks. GBL can be converted into GHB, a substance with psychoactive effects, which is often regulated due to its abuse potential.

If you have specific questions about butyrolactones or any related substances, please provide more details so I can offer more accurate information. Additionally, for any health-related concerns or questions about specific chemicals, it's advisable to consult with professionals in the relevant fields or contact poison control centers in your region.