Also: Murchison meteorite, carbonaceous chondrites
The Murchison meteorite fell in Australia in 1969. It and similar carbon-rich meteorites carry amino acids and the letters of the genetic code formed in space.
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Kvenvolden and colleagues reported evidence for extraterrestrial amino acids and hydrocarbons in the Murchison meteorite.
As reported in: KVENVOLDEN, LAWLESS, PERING et al. (1970). Evidence for Extraterrestrial Amino-acids and Hydrocarbons in the Murchison Meteorite. Nature. doi:10.1038/228923a0
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Callahan and colleagues analysed 12 meteorites and found a wide range of nucleobases and related molecules, supporting that they formed in space rather than from Earth contamination.
As reported in: Callahan, Smith, Cleaves et al. (2011). Carbonaceous meteorites contain a wide range of extraterrestrial nucleobases. Proceedings of the National Academy of Sciences. doi:10.1073/pnas.1106493108
Oba and colleagues detected purines and pyrimidines including cytosine, uracil and thymine in three carbon-rich meteorites, measuring down to parts per trillion.
As reported in: Oba, Takano, Furukawa et al. (2022). Identifying the wide diversity of extraterrestrial purine and pyrimidine nucleobases in carbonaceous meteorites. Nature Communications. doi:10.1038/s41467-022-29612-x