Chemistry puzzle for you

Please tell me, what happens when:

(RS)-6-(5-chloropyridin-2-yl)-7-oxo-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-yl 4-methylpiperazine-1-carboxylate
(http://en.wikipedia.org/wiki/Zopiclone)

Meets with the dental Amalgam filling mix in the mouth? Am I seeing exactly what I think I'm seeing? A direct carbonation reaction between methane molecules and Amalgam chemistry in a wealky alkiline soution in the mouth?

I spat gray.

Gray directly from my mouth.
Thanks for replies,
-illys Tweet