Not Less Than - 95%
Ambrisentan Hydroxy Acid Impurity (S-Isomer); (S)-2-Hydroxy-3-methoxy-3,3-diphenylpropionic Acid; 2S-2-Hydroxy-3-methoxy-3,3-diphenylpropanoic Acid; (S)-α-Hydroxy-β-methoxy-β-phenyl-benzenepropanoic Acid