... -pyrrolidone, 1-Methyl-2-pyrrolidinone , polyvinyl pyrrolidone, and α-Acetyl-γ-butyrolactone, etc.(2)GBL can be used ... ciprofloxacin and interferon, as the intermediate of vitamin and rolicyprine;(3) GBL is the intermediate of plant growth stimulator and ... insecticide.(4)GBL is a good antioxidant, plasticizer, extractant, adsorbent, dispersant, fixative and curing ...