Table 2.

Antibacterial activity of diterpenes isolated from P. elisabethae (SW Caribbean) in two Gram-positive bacteria.

Compounds	IC50 ± S.E (μM) *
	S. aureus	E. faecalis
PsG	4.48 ± 0.18	3.14 ± 0.22
PsP	14.91 ± 0.20	37.35 ± 0.29
PsQ	3.30 ± 0.20	7.38 ± 0.16
PsS	3.89 ± 0.23	20.20 ± 0.25
PsT	5.39 ± 0.25	4.38 ± 0.16
PsU	2.97 ± 0.17	3.19 ± 0.25
3-O-Ac-PsU	20.23 ± 0.19	7.64 ± 0.16
seco-PsJ	6.52 ± 0.12	4.08 ± 0.19
seco-PsK	4.20 ± 0.16	3.82 ± 0.21
IMNGD**	2.33 ± 0.09	3.47 ± 0.15
Penicillin G	1.61 ± 0.08	-
Vancomycin	-	4.21 ± 0.11

^*All compounds evaluated were inactive against the Gram-negative bacterium P. aeruginosa and the yeast C. albicans.

^**IC₅₀ (μg/mL).