Cheminformatics Puzzler #1

How can the above atropisomers be represented without using explicit 3D coordinates?
Source: Clayden, Worrall, Moran, and Helliwell Angew. Chem. Int. Ed.

How can the above atropisomers be represented without using explicit 3D coordinates?
Source: Clayden, Worrall, Moran, and Helliwell Angew. Chem. Int. Ed.