CAS 1042688-20-9 appears in our catalog under these names: (L)-2-[(t-Boc)amino]-2-[(5-fluoresceinyl)aminocarbonyl]ethyl methanethiosulfonate, 98%, (L)-2-((t-Boc)amino)-2-((5-Fluoresceinyl)aminocarbonyl)ethyl Methanethiosulfonate. Offered by: Chemat Brand, TRC. Available pack sizes: on request, 10mg.