The compound with CAS 631-01-6, commonly known as Quillaja saponaria extract or Quillaic acid, is a pentacyclic triterpenoid saponin. Structurally, it features a complex fused-ring system with multiple hydroxyl groups and a formyl group, characteristic of natural saponins derived from the soap bark tree. Its primary application is as a natural surfactant and emulsifier in the cosmetic and personal care industry, where it functions as an active functional ingredient for cleansing and foaming products. Additionally, it is widely used in the food industry as a natural foaming agent and emulsifier, particularly in beverages and as a flavoring agent. In vaccine development, Quillaja saponaria extract serves as a potent adjuvant, enhancing immune response. The compound is valued for its biodegradability and natural origin, making it a preferred alternative to synthetic surfactants. It also exhibits antimicrobial and anti-inflammatory properties, contributing to its versatility in both cosmetic formulations and functional food applications.