You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 2-(2,7-difluoro-3,6-dihydroxy-9H-xanthen-9-yl)-3,5,6-trifluoro-4-[2-[2-(4-hydroxy-3-nitrophenyl)ethylamino]-2-oxoethyl]sulfanylbenzoic acid .
user
C30H19F5N2O9S
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