'not' as atomic symbol

How do I disable the predicate interpretation of 'not'? I have an NL
application which involves the word 'not', but it seems to be trying to
interpret the word as a predicate rather than as an atomic symbol.

In SICStus, this wasn't a problem. I used the following statement to disable
the prolog interpretation of the following words:

:- op(0,fx,[(wait),(public),(mod),(dynamic)].

I thought the same might apply here:

:- op(0,fx,[(not)].

but this didn't work either. Any advice?
Thanks.

Randy



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