(-)-trans-Khellactone

9,10-Dihydro-9α,10β-dihydroxy-8,8-dimethyl-2H,8H-benzo[1,2-b:3,4-b']dipyran-2-one

(9R)-8,8-Dimethyl-9α,10β-dihydroxy-9,10-dihydro-2H,8H-benzo[1,2-b:3,4-b']dipyran-2-one

[9R,10S,(-)]-9,10-Dihydro-9,10-dihydroxy-8,8-dimethyl-2H,8H-benzo[1,2-b:3,4-b']dipyran-2-one