Compound Minimum Inhibition Concentration in µg/mL Gram positive bacteria Gram negative bacteria B. megaterium S. aureus B. subtilis E. coli P. vulgaris P. aeruginosa 6a 300 200 300 225 200 250 6b 375 350 350 300 225 350 6c 400 395 400 250 300 420 6d 375 400 350 300 275 350 6e 225 200 225 175 200 225 6f 300 300 275 225 225 225 6g 250 200 225 225 250 200 6h 175 125 150 50 50 75 6i 200 175 200 75 50 150 6j 200 150 100 100 75 100 Sf* 425 375 400 375 400 425 Sm* 20 20 20 20 20 20 *Sf= Sulfanilamide, Sm = Streptomycin

Table 1: Antimicrobial activities of the synthesized compounds 6a-6j.