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→Aromaticity: The bond that closes the ring should also be aromatic |
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[[Aromaticity|Aromatic]] rings such as [[benzene]] may be written in one of three forms:
# In [[August Kekulé|Kekulé]] form with alternating single and double bonds, e.g. <code>C1=CC=CC=C1</code>,
# Using the aromatic bond symbol <code>:</code>, e.g. <code>C1:C:C:C:C:
# Most commonly, by writing the constituent B, C, N, O, P and S atoms in lower-case forms <code>b</code>, <code>c</code>, <code>n</code>, <code>o</code>, <code>p</code> and <code>s</code>, respectively.
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