4-Quinolacetic Acid tert-Butyl Ester is an intermediate used in the synthesis of Hawkinsin TFA Salt (H195025), which is a urinary metabolite from the rare disorder of tyrosine metabolism, known as Hawkinsinuria; Also, it is derived from 4-Hydroxyphenylacetic Acid (H949060), which is a compound present in olive oil. An important fine chemical intermediate with broad prospects for application development.