CAS 21926-55-6 appears in our catalog under these names: 4-(2-Propynyloxy)benzoic acid, 4-(Prop-2-yn-1-yloxy)benzoic acid 97%, 4-(PROP-2-YN-1-YLOXY)BENZOIC ACID, 97%, 97%. Offered by: Biosynth, Ambeed, Chemat. Available pack sizes: 100mg, 50mg, 250mg, 1000mg, 500mg, 1g.