Table 3.

Minimum inhibitory concentration (MIC) values of the quinazolindione derivatives against Gram-negative Escherichia coli O78 strain.

Compound no.	MIC (µg/mL) after 24 hours
1	40
2	20
3	40
4	40
5	40
6	10
7	40
8	40

The compounds 2 and 6 exhibited the highest effect against Gram-negative E. coli O78 strain.