(Z,Z)-Cycloocta-1,5-diene 1,5-Cyclooctadiene (Z,Z) 1-cis,5-cis-Cyclooctadiene 1552-12-1 1Z,5Z-Cyclooctadiene 4-05-00-00403 (Beilstein Handbook Reference) BRN 1209288 EINECS 216-291-4 cis,cis-Cycloocta-1,5-diene