Table 2.

Minimum Inhibition Concentration (ppm) of new synthesized Pyrido[2,3-d]pyrimidin-4-one 5a,b; 6a,b and hydrazinyl Pyrido[2,3-d]pyrimidin-4-one 7-26 derivatives.

Compounds No.	Gram-positive bacteria		Gram-negative bacteria		Fungi
	St.	B.C.	E.C.	Salm.	C. Alb.
5a	100	100	100	100	100
6a	66.7	66.7	100	66.7	40
6b	200	200	100	100	66.7
9	25	25	18.2	25	16.7
12	16.7	25	16.7	16.7	13.3
13	10	13.3	8	10	10
14	10	13.3	10	13.3	10
15	16.7	20	16.7	13.3	8
16	20	20	13.3	25	20
23	25	40	16.7	20	13.3
24	40	40	20	20	16.7
25	40	25	25	25	25
26	40	66.7	25	25	16.7