CC(C)Oc1cccc2c1N=C(NCC(F)F)N[C@H]2C    mol21290    0_1
CC(C)Oc1cccc2c1N=C(NCC(F)F)[N-][C@H]2C    mol21290    -1_1
CC(C)Oc1cccc2c1N=C([N-]CC(F)F)N[C@H]2C    mol21290    -1_2