CAS 556112-20-0 appears in our catalog under these names: 3,4-Dichlorophenylacetylene, 1,2-Dichloro-4-ethynylbenzene 97%, 3,4-DICHLOROPHENYLACETYLENE, 97%, 1,2-Dichloro-4-ethynylbenzene, 98%, 98%, 1,2-Dichloro-4-ethynylbenzene, 98%. Offered by: Biosynth, Ambeed, Sigma-Aldrich, Chemat, Fluorochem. Available pack sizes: 2,5g, 0,25g, 250mg, 5g, 10g, 25g, 1G, 100mg.