Extended Data Fig. 1: Scheme of the synthesis of the A–D–A molecule.

Synthesis of Compound 3, the investigated A–D–A molecule. Synthesized from bisaldehyde (indicated as compound 1) and five equivalents of 1,3-indandione.

Synthesis of Compound 3, the investigated A–D–A molecule. Synthesized from bisaldehyde (indicated as compound 1) and five equivalents of 1,3-indandione.