You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule (2R)-3-[(1S,2S,2'S,4S,5'R,6R)-4-[(E,2R)-4-[(2S,2'R,4R,4aS,6R,8aR)-4-hydroxy-2-[(1R,3S)-1-hydroxy-3-[(2S,3R,6S)-3-methyl-1,7-dioxaspiro[5.5]undecan-2-yl]butyl]-3-methylidenespiro[4a,7,8,8a-tetrahydro-4H-pyrano[3,2-b]pyran-6,5'-oxolane]-2'-yl]but-3-en-2-yl]-5'-hydroxy-6-methylspiro[3-oxa-7-thiabicyclo[4.1.0]heptane-2,6'-oxane]-2'-yl]-2-hydroxy-2-methylpropanoic acid into molecular formula.
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C44H68O13S
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