making my first mod, under the <comps> can I make my own chemical type?

[reapingracoon]

I  am making my first mod right now and I want to make my own chemical type for a drug. In this section:
<comps>
       <li Class="CompProperties_Drug">
              <chemical>

[RawCode]

if you try your PC won't explode, also there is no "bad modding police" or something like that, just do it.