5-Amino-2,4-di-tert-butylphenol

It also serves as a building block in organic synthesis, finds application in analytical chemistry (as a standard for HPLC), and is studied for potential roles in creating other antioxidants and specialty chemicals, though its key role remains within pharmaceutical manufacturing. 5-Amino-2,4-di-tert-butylphenol (5-A-DTBP) is mainly a crucial pharmaceutical intermediate, most notably used in synthesizing Ivacaftor, a drug for cystic fibrosis, by reacting with oxo-dihydroquinoline carboxylic acid.