(7aS)-4,7a-dimethyl-6,7-dihydro-3H-2-benzofuran-1,5-dione

(7aS)-5-hydroxy-4,7a-dimethyl-5,6,7,7a-tetrahydroisobenzofuran-1(3H)-one

(1aS,4aS,7aS)-2-hydroxy-1a,4a-dimethyltetrahydro-7H-oxireno[2,3-d]isobenzofuran-5(1aH)-one

(1S,6S)-1,5-dimethyl-4-(dimethyl-tert-butylsilyloxy)-6-hydroxy-9-oxo-8-oxabicyclo[4.3.0]non-4(5)-ene

(1S,6S)-(+)-4-[(4R,E)-5-tert-butyldiphenylsilyloxy-4-methyl-2-pentenyloxy]-1,5-dimethyl-6-hydroxy-9-oxo-8-oxabicyclo[4.3.0]non-4(5)-ene