[{"from": "human", "value": "Describe this molecule. [C][=C][C][=Branch1][C][=O][O][C][=C][C][=C][Branch1][=Branch1][C][=C][O][Ring1][Branch1][C][=C][Ring1][=Branch2][Ring1][=C]"}, {"from": "gpt", "value": "The molecule are furocoumarins referred to collectively as psoralens that have photosensitizing activity and are used orally and topically in conjunction with ultraviolet irradiation for the therapy of psoriasis and vitiligo. Psoralens have been linked to a low rate of transient serum enzyme elevations during therapy and to rare instances of clinically apparent acute liver injury."}]