Table 1. Compounds Identified against Pl^pro and M^pro from the Microsource Spectrum Collection Library Screen^a.

compound	PLpro IC50 (μM)	Mpro IC50 (μM)
raloxifene	3.28 ± 0.29	42.8 ± 6.7
cetylpyridinium chloride	2.72 ± 0.09	7.25 ± 0.15
cefonicid sodium	2.17 ± 1.2
citicoline	1.35 ± 0.27
colistin sulfate	2.94 ± 0.54
β-lapachone	5.30 ± 0.29
tanshinone iia sulfonate sodium	2.76 ± 0.28
lobaric acid	10 ± 1.11

^aIt should be noted that compounds such as β-lapachone and tanshinone may be potential false positives involved in redox cycling.¹⁸