Synonyms: 8bH-Labd-14-en-19-oic acid,9,13:15,16-diepoxy-6b-hydroxy-, g-lactone,(-)- (8CI);Dispiro[furan-3(2H),2'(5'H)-furan-5',6''-[6H]naphtho[1,8-bc]furan]-2''(2''aH)-one,3',3'',4',4'',5'',5''a,7'',8'',8''a,8''b-decahydro-2''a,5''a,7''-trimethyl-,[2''aS-[2''aa,5''ab,6''a(S*),7''a,8''aa,8''ba]]-; (-)-Premarrubiin; Premarrubiin, (-)-