Synonyms: 2-Butenoicacid, 2-methyl-, 9,10-dihydro-8,8-dimethyl-2-oxo-2H,8H-benzo[1,2-b:3,4-b']dipyran-9,10-diylester, [9S-[9a(Z),10a(Z)]]-;(+) Pareruptorin B;(+)-Anomalin;(+)-Praeruptorin B;Pd II;Praeruptorin B;Anomalin;[8,8-Dimethyl-9-[(E)-2-methylbut-2-enoyl]oxy-2-oxo-9,10-dihydropyrano[6,5-h]chromen-10-yl] (E)-2-methylbut-2-enoate;