C17H16O5

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