120- STYROS® 2R Simulated-Monolith™ Polymeric Reversed Phase. Use of Capillary column of 0.5 mm ID using high and low pH’s to separate Sulfa drugs and precursor 120- STYROS® 2R Simulated-Monolith™ Polymeric Reversed Phase. Use of Capillary column of 0.5 mm ID using high and low pH's to separate Sulfa drugs and precursor