2-{[(4Z,7Z,10Z,13Z,16Z,19Z)-1-oxodocosa-4,7,10,13,16,19-hexaenyl]oxy}-3-hydroxypropyl (4Z,7Z,10Z,13Z,16Z,19Z)-docosa-4,7,10,13,16,19-hexaenoate 3-{[(4Z,7Z,10Z,13Z,16Z,19Z)-1-oxodocosa-4,7,10,13,16,19-hexaenyl]oxy}-2-hydroxypropyl (4Z,7Z,10Z,13Z,16Z,19Z)-docosa-4,7,10,13,16,19-hexaenoate