“…For example, compounds 4, 9, 25, 33, and 42, which contain higher electronegative group -OCH 3 or halogen as substituent R 1 , have higher activity than compounds 2, 8, 26, 20 and 43, which contain lower electronegative H atom. For another example, compounds 3, 6,9,12,13,14, and 17-19 with relatively lower electronegative C atom as the first atom of substituent X also show lower activity than compounds 20, 22, 25, 28, 31, 32, and 39-41 with relatively higher electronegative O atom. One bigger blue contour is found around the substituent R 2 , indicating that negatively charged substituent in the area is unfavorable.…”