[{"from": "human", "value": "Provide a brief overview of this molecule. [C][O][C][=C][C][=Branch1][O][=C][C][=C][Ring1][=Branch1][O][C][=C][Ring1][Branch1][C][=C][C][=Branch1][C][=O][O][Ring1][=N]"}, {"from": "gpt", "value": "The molecule is a naturally occurring substance isolated from the seeds of the plant Ammi majus with photoactivating properties.  As a member of the family of compounds known as psoralens or furocoumarins, methoxsalen's exact mechanism of action is unknown; upon photoactivation, methoxsalen has been observed to bind covalently to and crosslink DNA. (NCI04)"}]