STYROS® 2R Simulated-Monolith™ Polymeric Reversed Phase. Use of Micro Bore column of 1 mm ID using high and low pH’s to separate Sulfa drugs and precursor STYROS® 2R Simulated-Monolith™ Polymeric Reversed Phase. Use of Micro Bore column of 1 mm ID using high and low pH's to separate Sulfa drugs and precursor