CAS 151657-37-3 appears in our catalog under these names: 2,5-Dimethyl-3,4-dihydro-2H-pyrano[2,3-b]quinoline 97%, LI-YU QUINOLINE, 2,5-Dimethyl-3,4-dihydro-2H-pyrano[2,3-b]quinoline, 97%, 97%, 2,5-Dimethyl-3,4-dihydro-2H-pyrano[2,3-b]quinoline, 97%. Offered by: Ambeed, Sigma-Aldrich, Chemat, Fluorochem. Available pack sizes: 100mg, 250mg, 1g.