2-exo-bromo-3-endo-6-endo-dihydroxybicyclo[3.2.0]heptane

benzyl 2-(4-oxocyclopent-2-en-1-yl)acetate

(3aSR,5R,6aR)-(+)-5-Hydroxy-hexahydro-2H-cyclopenta(b)furan-2-on