You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2Z)-5-[(4-butylphenyl)methyl]-2-[(Z)-thiophen-2-ylmethylidenehydrazinylidene]-1,3-thiazolidin-4-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H21N3OS2
assistant