SPL Set ID: 90073508-6dca-4d27-aa5a-ed837737c35b

REZZAYO (rezafungin for injection), for intravenous use is a sterile solid (cake or powder) that contains rezafungin acetate. Rezafungin acetate is a semisynthetic lipopeptide synthesized from a fermentation product of Aspergillus nidulans . REZZAYO is an echinocandin, a class of antifungal drugs that inhibits the synthesis of 1,3-β-D-glucan, an essential component of fungal cell walls. REZZAYO contains 210 mg of rezafungin acetate, equivalent to 200 mg of rezafungin. REZZAYO also contains 47 mg histidine, 500 mg mannitol, 450 mg polysorbate 80, and hydrochloric acid and/or sodium hydroxide for pH adjustment. Rezafungin acetate is a hygroscopic, white to off-white powder. It is freely soluble in water, soluble in methanol, and sparingly soluble in ethanol. Rezafungin acetate is chemically designated as Echinocandin B, 1-[(4 R ,5 R )-4-hydroxy- N 2 -[[4"- (pentyloxy)[1,1':4',1"-terphenyl]-4-yl]carbonyl]-5-[2-(trimethylammonio)ethoxy]-L-ornithine]-4-[(4 S )-4- hydroxy-4-(4-hydroxyphenyl)-L-allothreonine]-, acetate (1:1). The empirical formula of rezafungin acetate is C 63 H 85 N 8 O 17 • C 2 H 3 O 2 , and the formula weight is 1285.46 g/mol. The chemical structure of rezafungin acetate is: image of chemicalstructure