Pd-III

Praeruptorin E

9,10-Dihydro-2-oxo-8,8-dimethyl-2H,8H-benzo[1,2-b:3,4-b']dipyran-9β,10β-diol 9-[(Z)-2-methyl-2-butenoate] 10-isovalerate

(9S)-2-Oxo-8,8-dimethyl-9,10-dihydro-2H,8H-benzo[1,2-b:3,4-b']dipyran-9β,10β-diol 9-[(Z)-2-methyl-2-butenoate] 10-(3-methylbutanoate)

(Z)-2-Methyl-2-butenoic acid [(9S,10S)-9,10-dihydro-8,8-dimethyl-10-(3-methyl-1-oxobutoxy)-2-oxo-2H,8H-benzo[1,2-b:3,4-b']dipyran]-9-yl ester