Which of the following is not a resonance structure of acetic anhydride? 
Definitions:
Atmosphere
The gaseous envelope that surrounds the solid Earth and includes air, clouds, and precipitation.
Glaciers
Large masses of ice that move slowly over land, formed by the accumulation and compaction of snow, and can shape landscapes through erosion.
Lakes
Large bodies of water surrounded by land, usually freshwater, but they can also be salty in some regions.
Groundwater
Water that is found underground in the cracks and spaces in soil, sand, and rock, which can form aquifers from which water can be extracted for use.
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