Synonyms: 1H-Benzofuro[3a,3-b]benzofuran-6-aceticacid, 2,3,4,4a,6a,6a-hexahydro-6aa-methoxy-4ab,7,9-trimethyl-3-oxo-, ethylester, (2,4-dinitrophenyl)hydrazone (7CI);1H-Benzofuro[3a,3-b]benzofuran-6-acetic acid, 3-[(2,4-dinitrophenyl)hydrazono]-2,3,4,4a,6,6a-hexahydro-6a-methoxy-4a,7,9-trimethyl-,ethyl ester, (4aa,6a,6ab,11aR*)- (9CI)