You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (1S,3S,4Z,12R,13S)-18-(2-chloro-6-methylphenyl)-15-[(2R)-1-hydroxy-4-methylpentan-2-yl]-3-methyl-10-oxa-2-thia-15,18-diazatetracyclo[11.8.0.01,16.03,12]henicosa-4,20-diene-11,14,17-trione by IUPAC nomenclature, provide its molecular formula.
user
C31H39ClN2O5S
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