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I was redirected here upon searching for E2D. In my case, the E2D I was looking for was trans-4,5-epoxy-(E)-2-decanal (O=CHCH₂CH₂(CHOCH)CH₂CH₂CH₂CH₂CH₃. This is the compound found in blood which attracts various animals and repels others, including homo sapiens. Humans are able to detect the molecule in air at < 1 ppt, apparently. These two compounds are not related. 98.21.70.161 ( talk) 16:34, 23 October 2017 (UTC) reply