You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule ethyl (E)-4-[(14R,15S)-8-tert-butyl-12,12,15-trimethyl-2,2,4-trioxo-2lambda6-thia-3,9,11,18,23-pentazatetracyclo[17.3.1.111,14.05,10]tetracosa-1(22),5(10),6,8,19(23),20-hexaen-17-yl]but-2-enoate into molecular formula.
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C31H43N5O5S
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