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structural formula for adenosine triphosphate:

$ - high energy single-bond

                             -.
            NH2               |
            |                 |
       N == C                 |
      /      \                |
H -- C        C -- N          |
      \\     //     \\        |
       N -- C        C -- H   |
              \     /         |
                 N            |
                 |             }- adenosine
                 C            |
                /  \          |
         OH -- C-H  \         |
               |     O        |
         OH -- C-H  /         |
                \  /          |
                 C   H        |
                / \ /         |
               H   C -- H     |             
                   |          |
                   O         -'
                   |         -. -. -.
             OH -- P == O      }-+--|- monophosphate (AMP)
                   |          |  |  |
                   O         -'  |  |
                   $             |  |
             OH -- P == O         }-+-- diphosphate (ADP)
                   |             |  |
                   O            -'  |
                   $                |
             OH -- P == O            }- triphosphate (ATP)
                   |                |
                   O               -'