2-09-00-00057 (Beilstein Handbook Reference) 2-CYCLOPENTENE-1-UNDECANOIC ACID, ETHYL ESTER 3552-12-3 BRN 2216346 EINECS 222-606-6 Ethyl 11-cyclopent-2-enylundecanoate Ethyl hydnocarpate Hydnocarpic acid ethyl ester