C[C@@H]1NC(NCC(F)F)=Nc2ccccc21    mol21297    0_1
C[C@@H]1NC([N-]CC(F)F)=Nc2ccccc21    mol21297    -1_1
C[C@@H]1[N-]C(NCC(F)F)=Nc2ccccc21    mol21297    -1_2