3,5,7,9-Undecatetraenoic acid, 2-(2-hydroxyethylidene)-11-(4-hydroxy-4-(2-hydroxyethyl)-2-oxo-6-oxa-3-azabicyclo(3.1.0)hex-1-yl)-4,6,10-trimethyl-11-oxo-, methyl ester, (1R-(1alpha(2E,3E,5E,7E,9E),5alpha,6alpha))-