Montelukast Ketocarbinol Impurity ; Montelukast Hydroxymethylcarbonyl Analog

Montelukast Ketocarbinol Impurity ; Montelukast Hydroxymethylcarbonyl Analog

1-[[[(1R)-1-[3-[(1E)-2-(7-Chloro-2-quinolinyl) ethenyl] phenyl]-3-[2-(1-oxo-2-hydroxyethyl) phenyl] propyl] thio] methyl] cyclopropaneacetic acid

Impurity reference standard used for related substances testing of Montelukast Acid drug substance and drug product per pharmacopoeial limits.