1.   He spent years studying sapogenin, a white crystalline compound obtained by chemically degrading the saponin occurring in many plants.

2.   Phenol is a white crystalline compound, a corrosive poison sometimes used to make explosives.

3.   The beads are coated with titanium dioxide, a white crystalline compound widely used in paint to replace potentially dangerous lead.

4.   Chemically Vitamin K is a fat soluble yellowish crystalline compound.