# Why are there different chemical structures for epinephrine (adrenaline)?

The Wikipedia structure is:

Note the empty bond at far-right.

"Journals on the Web" has:

And rxlist.com shows:

There's an extra H going into the page! Is one of these incorrect, or are they all consistent but w/ some implied bonds or something?

Many thanks.

EDIT: Apologies for the delay, but thank you to the responders. I get it.

The $\ce{-CH3}$ is implied at the end of the "stick," just like how the carbon atoms aren't explicitly labeled in the benzene ring.
They are all consistent. With line diagrams, all bonds to "nothing" are actually implicit bonds to carbon (this is why the benzene ring and carbon tail can be drawn without $\ce{C}$ in each of your diagrams). In addition, hydrogens are added implicitly until each carbon is saturated. So they are all the same structure.