How is 12-Hydroxy-7,18-dioxo-15-(stearoyloxy)-3,6,11,13,17-pentaoxa-8-aza-12-phosphapentatriacontan-1-oic acid 12-oxide ammoniate (CAS: 474922-20-8) typically synthesized?

This compound is synthesized through a multi-step process involving the synthesis of a phosphoric acid ester, followed by ring-opening, and subsequent derivatization. Commonly used catalysts include strong acids like concentrated sulfuric acid. The yield is typically around 75-85%, and the process requires careful control of temperature and reaction time to achieve high selectivity.