CC(C)(C)N1C=CN(C(C)(C)C)C1[Au]Cl
CCP(CC)(CC)=[Au]S[C@@H]1O[C@H](COC(C)=O)[C@@H](OC(C)=O)[C@H](OC(C)=O)[C@H]1OC(C)=O
OC[C@H]1O[C@H](S[Au])[C@H](O)[C@@H](O)[C@@H]1O
gold is thiophilic. These can be sourced from eMolecules and tested vs MPro especially as auronofin acts on covid-19 cells "Georgia State Researchers Find Rheumatoid Arthritis Drug Is Effective Against Coronavirus". News Hub. 15 April 2020. Retrieved 15 April 2020.
Not really related to the fragments but a different warhead approach. Note: I wasn't able to submit: C(C(C(=O)O[Na])S[Au])C(=O)O[Na].O Sodium aurothiomalate hydrate