CAS 252989-57-4 appears in our catalog under these names: 5-Ethynylnicotinaldehyde 98%, 5-Ethynylnicotinaldehyde, 97%, 97%, 5-Ethynylnicotinaldehyde, 97%. Offered by: Ambeed, Chemat, Fluorochem. Available pack sizes: 100mg, 250mg, 1g, 5g, 25g, 500mg, 2.5g, 10g.