Apparently it’s not even really all that stable, so that whole container would rapidly decompose into probably carbon dioxide (CO2) and a bunch of pure carbon (think charcoal). At least that’s my hunch. There is a Wikipedia article on the stuff, but it’s pretty short, since it’s a pretty unusual chemical (en.m.wikipedia.org/wiki/Dicarbon_monoxide).

CO2 is of course extremely common. I’d love to see what a chemist can describe about a bottle of C2O though!