CAS 5661-55-2 appears in our catalog under these names: 4-Phenylazetidin-2-one, 4-Phenylazetidin-2-one, 98%, 4-Phenyl-azetidin-2-one 98%, 4-Phenylazetidin-2-one, 98%, 98%. Offered by: Biosynth, Fluorochem, Ambeed, Chemat. Available pack sizes: 1g, 10g, 100mg, 250mg, 5g.