CAS 116920-04-8 appears in our catalog under these names: 5–((2，5–Dioxopyrrolidin–1–yl)oxy)–5–oxopentanoic acid, Pentanedioic acid 95%, 5-((2,5-Dioxopyrrolidin-1-yl)oxy)-5-oxopentanoic acid, Pentanedioic acid. Offered by: GLPBio, Ambeed, Chemat, MedChemExpress. Available pack sizes: 100mg, 1g, 250mg, 5g, 10g, 100 mg, 50 mg, 1 g.