CAS 102696-21-9 appears in our catalog under these names: 4-((2,5-Dioxopyrrolidin-1-yl)oxy)-4-oxobutanoic acid, 4-((2,5-Dioxopyrrolidin-1-yl)oxy)-4-oxobutanoic acid 96%, 4-((2,5-Dioxopyrrolidin-1-yl)oxy)-4-oxobutanoic acid, 96%, 96%. Offered by: Biosynth, Ambeed, Chemat. Available pack sizes: 50mg, 25mg, 100mg, 250mg, 1g.