You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[[[(3R)-3-(9H-fluoren-9-ylmethoxycarbonylamino)-4-methylpentanoyl]amino]methyl]-1,3-thiazole-4-carboxylic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H27N3O5S
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