1,3,5,7-cyclooctatetraene InChI=1/C8H8/c1-2-4-6-8-7-5-3-1/h1-8H/b2-1-,3-1-,4-2-,5-3-,6-4-,7-5-,8-6-,8-7 cycloocta-1,3,5,7-tetraene