CAS 1003-83-4 appears in our catalog under these names: Gadobutrol Impurity 29, 4,7-Dihydro-2,2-dimethyl-1,3-dioxepin, 2,2-Dimethyl-4,7-dihydro-1,3-dioxepine, 2,2–Dimethyl–1,3–dioxacyclohept–5–ene, 2,2-Dimethyl-1,3-dioxacyclohept-5-ene, >98.0%(GC). Offered by: Chemat Brand, TRC, Mikromol, GLPBio, Biosynth. Available pack sizes: on request, 10g, 1g, 2,5g, 100mg, 100g, 25g, 5g.