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In page Simplified Molecular Input Line Entry System:

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Aromatic rings such as benzene may be written in one of three forms:

  1. In Kekulé form with alternating single and double bonds, e.g. C1=CC=CC=C1,
  2. Using the aromatic bond symbol :, e.g. C1:C:C:C:C:C1,[citation needed] or
  3. Most commonly, by writing the constituent B, C, N, O, P and S atoms in lower-case forms b, c, n, o, p and s, respectively.