You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(5Z)-3-cyclopropyl-5-[[4-(oxolan-2-ylmethoxy)phenyl]methylidene]-2-sulfanylidene-1,3-thiazolidin-4-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H19NO3S2
assistant