1-bromo-4-ethynyl-2,5-dipropoxybenzene InChI=1/C14H17BrO2/c1-4-7-16-13-10-12(15)14(17-8-5-2)9-11(13)6-3/h3,9-10H,4-5,7-8H2,1-2H benzene, 1-bromo-4-ethynyl-2,5-dipropoxy-