Good morning to all,

I need to place a argument under the compound.
For the first compound it's ok, but for the second and third compounds 
the argument is placed in front an not bellow. 

How I can fix that? thanks.

\usemodule[chemic]

\startformula
  \chemical{Fe^{3+}}{}{yellow}
  \chemical{PLUS}
  \chemical{SCN^{-}}{}{colourless}
  \chemical{EQUILIBRIUM}
  \chemical{[FeSCN]^{2+}}{}{red}
\stopformula