You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (5S,8S)-8-(4-aminobutyl)-5-(1H-indol-3-ylmethyl)-14-oxa-2,11-dithia-4,7-diazabicyclo[10.3.0]pentadec-1(12)-ene-6,9,13,15-tetrone by IUPAC nomenclature, provide its molecular formula.
user
C23H26N4O5S2
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