Cc1nnc(C)c(C)n1    mol4257    0_1
Cc1nc(C)c(C)n[nH+]1    mol4257    1_1
Cc1n[nH+]c(C)c(C)n1    mol4257    1_2
Cc1nnc(C)c(C)[nH+]1    mol4257    1_3