CCNc1ccnc(O)n1    mol4187    0_1
CC[NH2+]c1ccnc([O-])n1    mol4187    0_2
CCNc1ccnc(O)[nH+]1    mol4187    1_1
CCNc1cc[nH+]c(O)n1    mol4187    1_2
CC[NH2+]c1ccnc(O)n1    mol4187    1_3