Cc1cnc(C)c(C)n1    mol4000    0_1
Cc1cnc(C)c(C)[nH+]1    mol4000    1_1
Cc1c[nH+]c(C)c(C)n1    mol4000    1_2
Cc1c[nH+]c(C)c(C)[nH+]1    mol4000    2_1