2-ethynyl-1,4-dipropoxybenzene InChI=1/C14H18O2/c1-4-9-15-13-7-8-14(16-10-5-2)12(6-3)11-13/h3,7-8,11H,4-5,9-10H2,1-2H benzene, 2-ethynyl-1,4-dipropoxy-