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Every time a shield bug flies into my room I try to kill it. Unfortunately, they leave a strong smell after crushing them. Whenever I smell their odor, I always wonder what the chemical compound is that the bug releases. Does anyone know what the smelly chemical is? If so, please help me out. I always wanted to know what that molecule was.

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    $\begingroup$ is this helpful? $\endgroup$ – another 'Homo sapien' Sep 12 '16 at 17:45
  • $\begingroup$ bed bugs also have a very bad smell. $\endgroup$ – Always Confused Sep 12 '16 at 19:26
  • $\begingroup$ Some-how this question is locked for edit. (How?) . However tag add suggestion "identification" because this question basically seeking identification of a compound. $\endgroup$ – Always Confused Sep 12 '16 at 19:28
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    $\begingroup$ If you don't like the smell, you could always try to not kill it. Let it find it's own way out or help it on it's way with a glass and a piece of paper. $\endgroup$ – Alex Sep 13 '16 at 8:36
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    $\begingroup$ If an edit is already made and has not been approved then no further edits are allowed until the edit is approved/disapproved. @AlwaysConfused $\endgroup$ – Tyto alba Jan 2 '17 at 7:16
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Shield bugs (also known as stink bugs) are a group of insects in the superfamily Pentatomoidea. As summarized by this article from Rice University, the components of the chemical odor of these insects consist primarily of long chain alkanes, aldehydes, and esters. Esters are to be expected as they're the primary components of many odors. This article also includes other ecological info about the shield bugs' stink, as well as links to some references (including this peer reviewed journal article by Krall et all (1999)).

Another article mentions a 2006 study from Clemson University that identified 2 of the aldehydes in stink bug odor as trans-2-decenal and trans-2-octenal.

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