Compound R1 R2 R3 R4 R5 R6 C, µM % reduction in RLU* 4 H NO2 H OMe H OMe 160 92.19 5 H NO2 H H H NMe2 169 90.06 6 H H NO2 OMe H H 177 94.30 7 H OH H H H OMe 197 98.90

*RLU- Relative Light Units

Table 1: Chalcone derivatives studied by Sivakumar et al. [7].