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-[(E)-2-[(3E)-5,5-bis(ethoxycarbonyl)-3-[(2E)-2-[5-[(4-ethoxy-4-oxobutyl)-methylsulfamoyl]-3,3-dimethyl-1-(3-sulfopropyl)indol-2-ylidene]ethylidene]cyclohexen-1-yl]ethenyl]-2,3,3-trimethyl-1-(3-sulfopropyl)indole-5-sulfonic acid .
user
C50H69N3O17S4
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