Table 1. The distribution of the drug compounds in dataset S.

Class code	Target-based class	Target-based class abbreviation	Number of drug compounds
1	G protein-coupled receptors	GPCR	657
2	Cytokine receptors	CR	35
3	Nuclear receptors	NR	228
4	Ion channels	IC	257
5	Transporters	T	37
6	Enzymes	E	451
7	Protein kinases	PK	28
8	Cellular antigens	CA	9
9	Pathogens	P	313
Total	—-	—-	2,015