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Methyl Methacrylate
Monomeric methyl methacrylate can be freed of hydroquinone
inhibitor by shaking with 5 N sodium hydroxide and desiccating
with 8-mesh calcium chloride.
H2C=C(CH3)COOCH3
The plastic in perspex (the common US name is plexiglas) is poly(methyl methacrylate).
According to Sheldon Cooper - yes, and he can smell it.