Synonyms: 2H,3H-Cyclopenta[d']naphtho[1,8-bc:2,3-b']difuran-6-aceticacid, 3-(acetyloxy)-8-(2,5-dihydro-2-oxo-1H-pyrrol-3-yl)-2a,4,5,5a,6,6a,8,9,9a,10a,10b,10c-dodecahydro-2a,5a,6a,7-tetramethyl-5-[(2-methyl-1-oxo-2-butenyl)oxy]-,methyl ester, [2aR-[2aa,3b,5b(E),5aa,6a,6aa,8b,9ab,10aa,10ba,10cb]]-; Salannolactam 21