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. 2020 Oct 29;8:700. doi: 10.3389/fchem.2020.00700

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Copyright © 2020 Sugiura.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Molecular structures of CPL fluorophores studied in the early stage of this science. Molecular structures of one of the isomers of 1–5 are shown. The chiral center and chiral axes of 2-4 are indicated with asterisks.