You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (2R,3S,8R,10R)-2-(5-bromo-2-hydroxy-3-methoxyphenyl)-3,5,6,8-tetrachloro-13-phenyl-11,13,15-triazatetracyclo[8.7.0.03,8.011,15]heptadeca-1(17),5-diene-4,7,12,14-tetrone by IUPAC nomenclature, provide its molecular formula.
user
C27H18BrCl4N3O6
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