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 2,4,5-trimethyl-N-[(2R)-2-(5-methylfuran-2-yl)-2-morpholin-4-ylethyl]thieno[2,3-d]pyrimidine-6-carboxamide .
user
C21H26N4O3S
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