R	Growth inhibition (I%)
R	12.5 (µg∙mL⁻¹)	25 (µg∙mL⁻¹)	50 (µg∙mL⁻¹)	100 (µg∙mL⁻¹)
H	0.0	10	100	100
Br	100	100	100	100
CH₃O-C=O	100	100	100	100
CN	42	100	100	100
OH	73.5	100	100	100
CH₂OH	0.0	0.0	5.2	27.1
COOH	0.0	0.0	0.0	0.0
Gramine	0.0	0.0	7.2	100