You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (2S)-2-[1-[(5R,6S)-2-[3a,4,5,6,7,7a-hexahydro-1-benzofuran-6-yl(hydroxy)methyl]-7-hydroxy-5-methyl-3,4,4a,5,6,7,8,8a-octahydro-1H-isoquinolin-6-yl]ethenylamino]-5-(sulfanylamino)pentane-1,1-diol by IUPAC nomenclature, provide its molecular formula.
user
C26H45N3O5S
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