C1N2CN3CN1CN(C2)C3    mol5137    0_1
C1N2CN3CN1C[NH+](C2)C3    mol5137    1_1
C1N2C[NH+]3CN1C[NH+](C2)C3    mol5137    2_1
C1N2C[NH+]3C[NH+]1C[NH+](C2)C3    mol5137    3_1
C1[NH+]2C[NH+]3C[NH+]1C[NH+](C2)C3    mol5137    4_1