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I’m not a chemist, but just for fun I was playing around with other possible ways to put together purine nucleobases by changing where the double bonds go on the pyrimidine ring and where amino groups, carbonyls and hydrogens were placed in the 1, 2, 3, & 6 positions. All without adding any other functional groups, like methyl or hydroxyl groups and without changing the imidazole ring. I was able to come up with 13 different configurations. Searching on the internet I was able to find many of the molecules and identify beta and iso configurations of named molecules. Can you confirm the names I’ve used, let me know if I’ve missed any, and help me with the identity of the 13th one? I came up with the following: Adenine, isoAdenine, Guanine, isoGuanine, 𝛽-Guanine, 𝛽-IsoGuanine, 2,6-diaminopurine, Xanthine, Hypoxanthine, isoHypoxanthine, 𝛽-Hypoxanthine, and 𝛽-IsoHypoxanthine. The 13th molecule is a purine with only hydrogen bound to the 2 and 6 positions and 3 double bonds in the pyrimidine ring. Looking for stuff like this on the internet I was struck by how little information I could find. Can you point me to any related resources or literature? Thanks, Andy

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    $\begingroup$ It'd be helpful if you had some visuals in your question—by the way, your unnamed compound that only has hydrogens at the 2 and 6 positions is simply "purine." It sounds like you mostly have a handle on things—xanthine, hypoxanthines, 2,6-diaminopurine, etc etc all sound more or less correct to me. i'm unsure what you mean by "beta" in your nomenclature which is why visuals would help $\endgroup$ Sep 17 at 4:59

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