[{"from": "human", "value": "Based on the given information, design a molecule that meets the desired specifications. The molecule is an iminium ion obtained by protonation of the imino group of 2-methyl-1-pyrroline. It is the major microspecies at pH 7.3 (according to Marvin v 6.2.0.). It is a conjugate acid of a 2-methyl-1-pyrroline."}, {"from": "gpt", "value": "[C][C][=NH1+1][C][C][C][Ring1][Branch1]"}]