NCCNCN mol24466 0_1 NCCNC[NH3+] mol24466 1_1 NCNCC[NH3+] mol24466 1_2 NCC[NH2+]CN mol24466 1_3 NCC[NH2+]C[NH3+] mol24466 2_1 [NH3+]CCNC[NH3+] mol24466 2_2 NC[NH2+]CC[NH3+] mol24466 2_3 [NH3+]CC[NH2+]C[NH3+] mol24466 3_1