3N4O:
reference: Insights into the DNA stabilizing contributions of a bicyclic cytosine analogue: crystal structures of DNA duplexes containing 7,8-dihydropyrido [2,3-d]pyrimidin-2-one., Magat Juan EC, Shimizu S, Ma X, Kurose T, Haraguchi T, Zhang F, Tsunoda M, Ohkubo A, Sekine M, Shibata T, Millington CL, Williams DM, Takenaka A, Nucleic Acids Res. 2010 Jun 16. PMID: 20554855

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