[{"from": "human", "value": "Generate a molecule based on this description. The molecule is a member of the class of propanals that is propanal substituted by a methyl group at position 2. It has a role as a Saccharomyces cerevisiae metabolite. It is a member of propanals and a 2-methyl-branched fatty aldehyde."}, {"from": "gpt", "value": "[C][C][Branch1][C][C][C][=O]"}]