USP Warfarin RS— This is the acid form of Warfarin. Dry portion in vacuum over phosphorus pentoxide for 4 hours before using. Keep container tightly closed. Protect from light.

USP Warfarin Related Compound A RS [3-(o-hydroxyphenyl)-5-phenyl-2-cyclohexen-1-one] (C18H16O2 264.33) —Keep container tightly closed and protected from light.