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most ChemicalData molecule plots missing?


i'm getting a lot of missing molecule plots for even the simplest and  
most common molecules in ChemicalData[]...

in[]:=

	ChemicalData["CarbonMonoxide", "MoleculePlot"]
	ChemicalData["NitrogenDioxide", "MoleculePlot"]

out[]=
	Missing["NotAvailable"]
	Missing["NotAvailable"]

most hydrocarbons are also missing.

is this normal, or could there be something wrong with my mathematica  
install or a cached curated data problem?

i was expecting molecule plots to be automatically generated from the  
chemical formulas, but looks like it's not. i guess its down to  
manually using graphics3d, spheres, and cylinders ...

cheers,
Mitch



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