Table 1.

Number of drugs containing aromatic rings in the whole database and five sub-databases.

Number of Aromatic Rings	All Drugs	Oral Drug	CNS Drugs	Cardiovascular Drugs	Anti-Infective Drugs	Anti-Cancer Drugs
0	1245	164	138	112	174	108
1	2041	313	298	343	281	92
2	2341	365	529	360	307	103
3	826	145	110	129	104	86
>3	272	40	20	60	26	45