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This is the composition of matter patent amarin is pursuing. Check the 1st 9 pages of this below document. They are making the distinction between EPADEL and amr101. The argument is one has DHA , the other has no DHA.
Link -> http://www.scribd.com/doc/85620902/12052598
Note this is a granted patent for which a terminal disclaimer has already been approved and they are trying to make some amendments. See Link