2-Cyclopentene-1-undecanoic acid sodium salt 459-67-6 5587-76-8 Alepol EINECS 226-991-1 Hydnocarpate sodium Sodium cyclopent-2-ene-1-undecanoate Sodium gynocardate Sodium hydnocarpate Undecanoic acid, 11-(2-cyclopenten-1-yl)-, sodium salt