You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[(3-benzyl-2-oxo-3H-imidazo[1,2-c]quinazolin-5-yl)sulfanyl]-N-[(4-chlorophenyl)methyl]acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H21ClN4O2S
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