The rest four fragments are relatively less significant and included in a smaller number of molecules, less than 20. The fifth and sixth fragments are quinoxaline-like and 1-phenylpyrazole-like fragments with the mean oscillator strength of 0.371 and 0.344, respectively. Unlike the other fragments, the last two fragments, mesitylene and 2-methylhex-1-en-4-yne, do not have nitrogen inside its scaffold.