(8,8'-Bi-2H-naphtho(1,8-bc)furan)-2,2'-dione, 3,3',4,4'-tetrahydroxy-7,7'-dimethyl-5,5'-bis(1-methylethyl)- 135692-96-5 3,3',4,4'-Tetrahydroxy-7,7'-dimethyl-5,5'-bis(1-methylethyl)-(8,8'-bi-2H-naphtho(1,8-bc)furan)-2,2'-dione Gossylic lactone