Synonyms: 2-Butenoicacid, 2-methyl-,7,8-dihydro-8,8-dimethyl-7-[(3-methyl-1-oxo-2-butenyl)oxy]-2-oxo-2H,6H-benzo[1,2-b:5,4-b']dipyran-6-ylester, (Z)-; Crotonic acid, 2-methyl-, 6-ester with7,8-dihydro-6,7-dihydroxy-8,8-dimethyl-2H,6H-benzo[1,2-b:5,4-b']dipyran-2-one3-methylcrotonate, (Z)-(-)- (8CI); 2H,6H-Benzo[1,2-b:5,4-b']dipyran, 2-butenoicacid deriv.; Andelin