Lu, J., Li, Y., Ok, K. M. (2025). Five-Membered [C<sub>5</sub>O<sub>5</sub>]<sup>2<b>–</b></sup> Rings as Birefringence-Active Genes for Ultrabirefringent Crystals. Journal of the American Chemical Society. https://doi.org/10.1021/jacs.5c12128