Compounds synthesised by Li et al.³⁴ MIC values obtained using M. tuberculosis.

Compound 18	MIC (μg/mL)
(a) R1 = H, R2 = H, R3 = H, R4 = O	0.64
(b) R1 = Me, R2 = H, R3 = H, R4 = O	25
(c) R1 = H, R2 = Me, R3 = H, R4 = O	>100
(d) R1 = H, R2 = F, R3 = H, R4 = O	0.63
(e) R1 = H, R2 = Cl, R3 = H, R4 = O	5
(f) R1 = H, R2 = NO2, R3 = H, R4 = O	50
(g) R1 = H, R2 = EtSO2, R3 = H, R4 = O	>100
(h) R1 = H, R2 = H, R3 = Me, R4 = O	100
(i) R1 = H, R2 = H, R3 = F, R4 = O	0.63
(j) R1 = H, R2 = H, R3 = Cl, R4 = O	0.63
(k) R1 = H, R2 = H, R3 = NO2, R4 = O	>100
(l) R1 = H, R2 = H, R3 = H, R4 = NH	>100
(m) R1 = H, R2 = H, R3 = H, R4 = S	>100