You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named ethyl 4-[3-[(E)-[3-[2-(4-methoxyphenyl)ethyl]-4-oxo-2-sulfanylidene-1,3-thiazolidin-5-ylidene]methyl]-9-methyl-4-oxopyrido[1,2-a]pyrimidin-2-yl]piperazine-1-carboxylate by IUPAC nomenclature, provide its molecular formula.
user
C29H31N5O5S2
assistant