EC ₅₀ values of the 4g, 4k, 4l and 4u against TMV in vivo^a.

Compd.	Against TMV	Regression equation	r 2	EC50
4g	Curative activity	y = 0.3961x + 4.5075	0.9707	17.5 ± 0.34
	Protection activity	y = 0.4213x + 3.9441	0.9534	320.8 ± 0.19
	Inactivation activity	y = 0.5973x + 4.0952	0.9654	32.7 ± 0.03
4k	Curative activity	y = 0.3432x + 4.5403	0.9006	21.8 ± 0.05
	Protection activity	y = 0.2912x + 4.2541	0.9415	364.3 ± 0.21
	Inactivation activity	y = 0.2248x + 4.9103	0.9939	2.5 ± 0.04
4l	Curative activity	y = 0.3387x + 4.6487	0.9347	10.9 ± 0.02
	Protection activity	y = 0.3195x + 4.3930	0.9078	79.4 ± 0.22
	Inactivation activity	y = 0.5142x + 4.1551	0.9541	43.9 ± 0.03
4u	Curative activity	y = 0.4456x + 4.1718	0.9690	72.2 ± 4.04
	Protection activity	y = 0.4467x + 4.2318	0.9440	52.4 ± 0.06
	Inactivation activity	y = 0.2934x + 4.4604	0.9156	68.9 ± 0.19
Ningnanmycinb	Curative activity	y = 0.4415x + 4.1563	0.9720	81.4 ± 0.28
	Protection activity	y = 0.4732x + 4.0939	0.9097	82.2 ± 0.05
	Inactivation activity	y = 0.4591x + 4.9815	0.9056	1.1 ± 0.02

^aAverage of three replicates.

^bA commercial agricultural antiviral agent ningnanmycin was used for comparison of antiviral activities.