You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule identified by (2R)-2-[(5E)-5-[(3-bromophenyl)methylidene]-4-oxo-2-sulfanylidene-1,3-thiazolidin-3-yl]-3-methylbutanoic acid ?
user
C15H14BrNO3S2
assistant