double bond equivalents \({\rm{ = 1 + \raise.5ex\hbox{$\scriptstyle 1$}\kern-.1em/ \kern-.15em\lower.25ex\hbox{$\scriptstyle 2$} }}\sum_{\rm i}{\rm n}_{\rm i} ({\rm v}_{\rm i} - 2)\)ni: number of atoms of element i in molecular formula vi: formal valence of element i.
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Pretsch, E., Bühlmann, P., Badertscher, M. (2009). Summary Tables. In: Structure Determination of Organic Compounds. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-93810-1_2
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