Synonyms: (4S)-4a,5,6,7-Tetrahydro-3,4aβ,5β-trimethyl-6β-hydroxy-4β-[(Z)-2-methyl-2-butenoyloxy]naphtho[2,3-b]furan-9(4H)-one;(Z)-2-Methyl-2-butenoic acid (4S)-4,4a,5,6,7,9-hexahydro-6β-hydroxy-3,4aβ,5β-trimethyl-9-oxonaphtho[2,3-b]furan-4β-yl ester;6β-Angeloyloxy-3β-hydroxy-9-oxoeuryopsin