The molecular formula C17H16O5 (molar mass: 300.30 g/mol, exact mass: 300.099773 u) may refer to: * Coelogin, a phenanthrenoid found in the orchid Coelogyne cristata * Confusarin, a phrenathrenoid found in orchids * Flavokavain C, a kavalactone * Gymnopusin, a phenanthrenoid found in several orchids * Methyllinderone * Plicatol A, a phenanthrenoid found in the orchid Flickingeria fimbriata * 3,4,8-Trimethoxyphenanthrene-2,5-diol, a phenanthrenoid found in the orchid Dendrobium nobile This set index page lists chemical structure articles associated with the same molecular formula.If an internal link led you here, you may wish to change the link to point directly to the intended article.