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I saw this picture on a teacher's wall and I noticed the C single bonded to the N on the right side. How is it possible that carbon has four bonding sites but is only using one in the picture? Is this stable?

structure of caffeine

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    $\begingroup$ That's impossible, of course. It is just another $\ce{CH3}$ that did not fit. $\endgroup$ Aug 9, 2016 at 21:09
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    $\begingroup$ Compare to Wikipedia: it should be a CH₃. Also, the five-member (imidazole) ring is missing a double bond. In addition to being badly drawn. $\endgroup$
    – F'x
    Aug 9, 2016 at 21:09
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    $\begingroup$ Fun fact: The pentagon that is drawn (regardless of whether we consider it poorly drawn) tessellates unlike a 'well-drawn' imidazole ring. $\endgroup$
    – Lighthart
    Aug 9, 2016 at 21:52

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