[NTG-context] Using comma character inside chemical

[Jaroslav Hajtmar]

Hello all,

Is there a way to use comma character or semicolon character inside the 
chemical formula?
Comma character is used as a delimiter of individual items in the formula.

When is there command for example \lettertilde, is there something like 
"\lettercomma (\charcomma)", "\lettersemicolon (\charcomma)" and others 
nonalphanumerics characters (which would be used inside chemical or 
mathematical environment)?

Emergency, we can solve as follows:
\unexpanded\def\charcomma{,}
\chemical{0\charcomma5\cdot, etc.}

Is there is a more elegant solution?

Thanx
Jaroslav