COc1ccc(C2CC(c3cccs3)=NN2C(=O)CCl)cc1OC
COc1ccccc1OCCNC(=O)c1cc(=O)[nH]c2ccccc12
Cc1cc(C)c(C)c(S(=O)(=O)N2CCN(C(=O)c3cc(=O)[nH]c4ccccc34)CC2)c1C
O=C(c1cc(=O)[nH]c2ccccc12)N1CCN(c2ccccc2)CC1
https://pubchem.ncbi.nlm.nih.gov/bioassay/1890 all under 10 micromolar hits in this assay of the original SAR-CoV main protease. They are all also easily purchasable from Enamine, in their Screening library: Z56955922 Z30450892 Z29513321 Z27770229
Note: no fragments used in this decision