A weird chord

[Brett McCoy]

I am typesetting a lead sheet and it has a very strange chord --
G7b9#9. I confirmed that this chord is correct (freakin jazz people
;-P ), but can't figure out how to get the chord name to display.
Using g:7.9-.9+ only results in g7#9 since Lilypond doesn't like two
of the same steps in the chord. I guess doing g:7.9-.10- would work
(it yields G7b9(addb10) which looks even weirder... I guess I can live
with that but if anyone has a suggestion on how to typeset this, it
would be really helpful.

-- Brett
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"In the rhythm of music a secret is hidden;
    If I were to divulge it, it would overturn the world."
               -- Jelaleddin Rumi