conditions
column: ace ultracore 2.5 superc18
dimensions: 50 x 3.0 mm
part number: core-25a-0503u
mobile phase: h2o/meoh/glacial acetic acid(60:40:1.5 v/v/v)
flow rate: 0.85 ml/min
injection: 1.5 μl
temperature: ambient (22 °c)
detection: uv, 276 nm
analytes
1. guaifenesin
2. benzoic acid