Table 2.

Antibacterial activity of the compounds 4a-h and 5a-h.

Compound	Gram positive bacteria		Gram negative bacteria
	S. aureus	B. subtilis	P. aeruginosa	E.coli
Ampicillin	+ + +	+ +	+ +	+ + +
Streptomycin	+ + +	+ + +	+ + +	+ + +
4a	+ +	-	+	+ +
4b	+	-	-	+
4c	-	+	-	+
4d	+ +	+	+	+ +
4e	+ +	+	+ +	+ + +
4f	+ +	+ +	-	+ + +
4g	+	-	+ + +	+ + +
4h	+	+ +	+ + +	+ +
5a	+	+ +	+ +	+
5b	-	+	-	+
5c	+	+	+	+ +
5d	+ +	+ +	-	+
5e	+ + +	-	+	+ +
5f	-	+	+	+ + +
5g	+ + +	-	+ +	+ +
5h	+ + +	+ +	+ +	+ + +

Key to symbols: Inactive = - (inhibition zone < 6 mm); Slightly active = + (inhibition zone 6-9 mm); Moderately active = + + (inhibition zone 9-12 mm); Highly active = + + + (inhibition zone > 12 mm).