| Synonyms: | PDII;(2Z,2'Z)-2-Methyl-2-butenoic acid (9S,10S)-9,10-dihydro-8,8-dimethyl-2-oxo-2H,8H-benzo[1,2-b:3,4-b']dipyran-9,10-diyl ester;Bis[(Z)-2-methyl-2-butenoic acid](9S,10S)-2-oxo-8,8-dimethyl-9,10-dihydro-2H,8H-benzo[1,2-b:3,4-b']dipyran-9β,10β-diyl ester;Bis[(Z)-2-methyl-2-butenoic acid][(9S,10S)-9,10-dihydro-8,8-dimethyl-2-oxo-2H,8H-benzo[1,2-b:3,4-b']dipyran]-9,10-diyl ester;Praeruptorin B(b);2-Butenoic acid, 2-methyl-, (9S,10S)-9,10-dihydro-8,8-dimethyl-2-oxo-2H,8H-benzo[1,2-b:3,4-b']dipyran-9,10-diyl ester, (2Z,2'Z)-;8,8-dimethyl-9-[(Z)-2-methylbut-2-enoyl]oxy-2-oxo-9,10-dihydropyrano[2,3-f]chromen-10-yl](Z)-2-methylbut-2-enoate;(+)-Praeruptorin B |