You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (1R,2R,6S,8R,9S)-4,4,11,11-tetramethyl-N-[3-oxo-3-(1,3-thiazol-2-ylamino)propyl]-3,5,7,10,12-pentaoxatricyclo[7.3.0.02,6]dodecane-8-carboxamide by IUPAC nomenclature, provide its molecular formula.
user
C18H25N3O7S
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