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The 211?212 transition of acetaldehyde at 3195 167 MHz has been observed in emission in SgrB2 with the Parkes 64 m telescope. Comparison of the intensities of the 110---&gt;  11 and 211---&gt;212 emission lines suggests that both transitions may be inverted.

Microwave Emission of the 211?212 Rotational Transition in Interstellar Acetaldehyde