[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is an isothiocyanate having a methyl group attached to the nitrogen. It is also the active nematicide of the pronematicide metam-sodium. It has a role as a fumigant, a nematicide and a lachrymator."}, {"from": "gpt", "value": "[C][N][=C][=S]"}]