tetrahydrocannabinol (thing)

The structural formula of tetrahydrocannabinol (THC), the principle active ingredient in marijuana is:

           H      (CH2)4CH3
            \    /
             C==C
            /    \
        HO-C      C-H
           \\    // 
      H  H   C--C
       \  \ /    \
        C--C      O
      //    \    /
  H3C-C      C--C-CH3
       \    / \  \
      H-C--C-H H  CH3
        |  |
        H  H