2-OCTYNOIC ACID 2-Octyn-1-oic acid 4-02-00-01714 (Beilstein Handbook Reference) 5663-96-7 BRN 1751225 EINECS 227-121-3 NSC 75855 Oct-2-ynoic acid Propiolic acid, pentyl ester Propiolic acid, pentyl- m-Pentyl propiolate