Table 2.

Minimum Inhibitory Concentration of 17 phenalenone derivatives tested against 6 bacterial strains (E.c. 1: Escherichia coli CIP54.8T, E.c. 2: Escherichia coli CIP53.126, S.a.: Staphylococcus aureus CIP76.25, S.e.: Staphylococcus epidermidis CIP109.562, B.c.: Bacillus cereus CH, P.a.: Pseudomonas aeruginosa CIP76.110) under dark (D) and light (L) conditions.

Compound	Minimum Inhibitory Concentration (µM)
	E.c. 1		E.c. 2		P.a.		S.a.		S.e.		B.c.
	D	L	D	L	D	L	D	L	D	L	D	L
4a	>200	100	>200	100	>200	200	>200	100	>200	200	>200	200
4b	>200	>200	>200	100	200	200	100	12.5	100	12.5	100	50
5	>200	>200	>200	>200	>200	>200	>200	100	>200	>200	>200	>200
5a	>200	>200	>200	>200	>200	>200	>200	>200	>200	200	>200	>200
5b *	>200	>200	>200	>200	>200	200	>200	200	>200	200	>200	200
6a	>200	50	>200	25	>200	200	50	6.25	200	12.5	>200	100
6b	ND	ND	ND	ND	ND	ND	25	3.12	6.25	0.78	25	6.25
7a	>200	200	>200	100	>200	>200	50	6.25	25	6.25	100	50
7b	>200	>200	>200	>200	>200	>200	6.25	0.78	6.25	0.78	12.5	3.12
8a	>200	100	>200	50	>200	100	25	0.78	12.5	1.56	25	12.5
8b	>200	200	>200	100	>200	200	50	0.39	12.5	0.78	50	6.25
9a	>200	100	>200	50	>200	>200	>200	25	>200	12.5	>200	200
9b	>200	>200	>200	>200	25	25	6.25	1.56	12.5	1.56	6.25	6.25
10	>200	100	>200	50	>200	12.5	>200	50	>200	100	>200	>200
10a	>200	>200	>200	>200	>200	200	>200	200	>200	100	>200	>200
10b	>200	>200	>200	>200	>200	>200	100	50	>200	12.5	>200	>200
SAPyR	>200	200	>200	>200	>200	50	>200	50	200	25	>200	50

* Compound obtained with a purity of 70%, mixed with 30% of compound 5. ND: Not data, compounds not soluble at the concentrations.