(E)-9-[(E)-1-carboxy-11-(2,5-dioxooxolan-3-yl)heptadec-12-en-8-yl]peroxy-12-(2,5-dioxooxolan-3-yl)octadec-13-enoic acid;18-[(E)-19-carboxy-7-(2,5-dioxooxolan-3-yl)nonadec-5-en-10-yl]-5,9-dimethyl-14,16-dioxo-19-propan-2-yl-15-oxapentacyclo[10.5.2.01,10.04,9.013,17]nonadecane-5-carboxylic acid;18-[(E)-19-carboxy-7-(2,5-dioxooxolan-3-yl)nonadec-5-en-10-yl]oxy-5,9-dimethyl-14,16-dioxo-19-propan-2-yl-15-oxapentacyclo[10.5.2.01,10.04,9.013,17]nonadecane-5-carboxylic acid;18-[(E)-19-carboxy-7-(2,5-dioxooxolan-3-yl)nonadec-5-en-10-yl]peroxy-5,9-dimethyl-14,16-dioxo-19-propan-2-yl-15-oxapentacyclo[10.5.2.01,10.04,9.013,17]nonadecane-5-carboxylic acid