You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2-N-ethyl-2-N-(1-methoxypropan-2-yl)-7-N-methyl-4,5,6,7-tetrahydro-1,3-benzothiazole-2,7-diamine by IUPAC nomenclature, provide its molecular formula.
user
C14H25N3OS
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