C45H38O18

The molecular formula C45H38O18 (molar mass: 866.77 g/mol, exact mass: 866.205814 u) may refer to:


 * Arecatannin B1, a condensed tannin found in the betel nut
 * Procyanidin C1, a condensed tannin found in grape
 * Procyanidin C2, a condensed tannin found in grape and barley