... Tetrahedron. Volume 49, Issue 4, 22 January 1993, Pages 771–784. ... The structure of vismiaquinone C, 7-geranylemodin, cinnalutein, 4,5-dihydroxydigitolutein, 2-hydroxyislandicin 1-methyl ether and calyculatone 1-methyl ether have been confirmed by unambiguous synthesis. ...