Cyclopropenone, c-H₂C₃O, in Sgr B2(N)

Cyclopropenone, c-H₂C₃O, has been detected with the 100m Greenbank telescope toward Sgr B2(N) – largely in absorption:
J. M. Hollis, A. J. Remijan, P. R. Jewell, and F. J. Lovas,
Cyclopropenone (c-H₂C₃O) a new Interstellar Ring Molecule
Astrophys. J. 642, 933–939 (2006).
The molecule can be viewed as a derivative of the ubiquitous, small aromatic cyclopropenylidene, c-H₂C₃.