SEARCH Articles Figures Tables 7-Butyrolactones, 2,4-disubstituted synthesis Butyrolactone Butyrolactone natural products synthesis Butyrolactone, synthesis Butyrolactones Hydroxy-7-butyrolactones, synthesis Y-Butyrolactone, 2,3,3-trimethylsynthesis synthesis Y-Butyrolactones, synthesis