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formaldehyde comparison table
Subject is a kind of has discovery in space date is an instance of has definition has symbol
interstellar moleculemolecule  Molecule present in interstellar space. As of late 1974, at least 33 molecular species had been identified with reasonable certainty. 
formaldehyde 1969interstellar moleculeAn organic molecule, the first polyatomic molecule to be discovered in interstellar space. In 1973 It was discovered in two external galaxies.H2CO

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