(±)4(5)-EpDPA methyl ester is a derivative of (±)4(5)-EpDPA which is stable enough to ship and handle routinely. The active free acid can be regenerated from the methyl ester by careful base hydrolysis. (±)4(5)EpDPA is a CYP450 metabolite of DHA which can be further metabolized to the diol metabolite. There are no published reports on the biological activity of (±)4(5)-EpDPA methyl ester at this time.