LC system: Aijiren I . Detection: UV detection at 254 nm using a DAD. Vials: TruView LCMS Certified Clear Glass vial (p/n:186005668CV) Column(s): CORTECS C 18 +, 2.1 x 50 mm, 2.7 µm (p/n: 186007395) XSelect CSH C 18, 2.1 x 50 mm, 2.5 µm (p/n: 186006101) Competitor Superficially Porous C 18, 2.1 x 50 mm, 2.7 µm. Column temp.: 30