Synonyms: 4-Methyldicamphanoylkhellactone;PA-344;4-Methyl-DCK;(9R,10R)-4,8,8-Trimethyl-9,10-bis[4(R),7,7-trimethyl-3-oxo-2-oxabicyclo[2,2,1]heptan-1(S)-ylcarbonyloxy]-9,10-dihydro-2H,8H-benzo[1,2-b:3,4-b']dipyran-2-one;3',4'-Di-O-[(-)-(S)-camphanoyl]-4-methyl-(3'R,4'R)-cis-khellactone