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1,3-Didocosahexaenoyl-2-palmitoyl glycerol is a triacylglycerol that contains docosahexaenoic acid at the sn-1 and sn-3 positions and palmitic acid at the sn-2 position. It has been found in higher amounts than 1-palmitoyl-2,3-didocosahexaenoyl-rac-glycerol (PDD) in Steller sea lion meat and harp seal oil and at lower amounts than PDD in the meat of a variety of fishes.¹

1. Gotoh, N., Matsumoto, Y., Nagai, T., et al. Actual ratios of triacylglycerol positional isomers consisting of saturated and highly unsaturated fatty acids in fishes and marine mammals Food Chem. 127(2),467-472(2011).