text: Yo, check it out, I got a method that's straight rap,
  High-performance liquid chromatography, no cap.
  Separation and determination of mirtazapine's foes,
  In bulk drugs and pharmaceutical formulations, here it goes.
  
  Six impurities, including mirtazapine's decay,
  Separated on a BDS Hypersil column, I gotta say.
  Four-point-six by two-fifty, five micrometers the size,
  With a mobile phase of triethylamine, acetonitrile, no lies.
  
  0.3% triethylamine at pH three, that's the trick,
  Mixed with acetonitrile, eighty-two percent to stick.
  Isocratic mode, eluted smooth and steady,
  Monitored at two-fifteen nm, photo diode array ready.
  
  Analytes studied in different solvent systems so diverse,
  Variable compositions, temperatures, and pH, no rehearse.
  We validated the method, precision, linearity, and such,
  Inter- and intra-day assay precision, less than point-nine-eight RSD, clutch.
  
  Recoveries ranged from ninety-five to a hundred-two point-two-two,
  With RSD less than two point two one, true.
  Calibration curves for mirtazapine and impurities,
  Correlation coefficients ranged point-nine-nine-four-one to point-nine-nine-nine-nine, no uncertainties.
  
  Applied the method to commercial formulations, no lie,
  Recoveries of mirtazapine, ninety-nine point three-eight to a hundred point seven-three, oh my!
  With RSD less than point five-two, we're on fire,
  Purity evaluation and simultaneous determination, this method's a desire.
  
  So there you have it, a rap-style rendition of the passage,
  The method's useful for mirtazapine's purity and related substance carriage.
  No need to worry, we got the science in the flow,
  High-performance liquid chromatography, yo, yo, yo!