3-Amino-5-chloro-2-hydroxybenzenesulfonic acid diazotization, with 3-Methyl-1-phenyl-1H-pyrazol-5(4H)-one coupling, and its product (C.I. Mordant Red 19) at 125 ℃ in Chromium formate in aqueous solution, heating 3 c to 40 minutes, and make them into Chromium complex, and translated into (2 s) – 1 – (3 – Acetylthio – 2 – methyl – 1 – oxopropyl) – L – proline form.
