1-[(4R,5R)-4,5-Dihydroxy-L-ornithine]echinocandin B

CAS 79411-15-7

1-[(4R,5R)-4,5-Dihydroxy-L-ornithine]echinocandin B (CAS 79411-15-7) has a chemical story that connects molecular identity with practical chemistry. CAS 79411-15-7 is commonly called the echinocandin B nucleus or anidulafungin nucleus. PubChem identifies it as C34H51N7O15 with molecular weight about 797.8. Its importance comes from semisynthetic echinocandin chemistry. Natural echinocandin B contains a lipid side chain; controlled deacylation provides the complex cyclic-peptide nucleus, which can then be reacylated with a deliberately designed side chain. This strategy turned a fermentation-derived natural-product scaffold into a platform for modern antifungal medicines. For anidulafungin, the preserved nucleus is joined to a synthetic lipophilic terphenyl side chain. CAS 79411-15-7 is therefore not anidulafungin itself but a crucial manufacturing intermediate that preserves the difficult stereochemical architecture while allowing medicinal chemists to redesign the peripheral region.

The exact registered form matters because related salts, stereoisomers, metabolites, intermediates or finished medicines can occupy very different roles even when their names look nearly interchangeable.