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. 2020 Apr 30;284:197989. doi: 10.1016/j.virusres.2020.197989

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Fig. 2 — The structure of selected naturally occurring compounds that demonstrate promising anti-coronavirus activity. (1) Quercetin (2) Quercetin 7-rhamnoside (3) Myricetin (4) Psoralidin (5) Caffeic acid (6) Tryptanthrin (7) Lycorine (8) Scutellarein (9) Silvestrol (10) Saikosaponin B2 (11) Isobavachalcone (12) Griffithsin. As annotated on (4), note the aromatic rings and substituted fused rings present in most compounds.