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 (5Z)-3-[2-(3,4-dimethoxyphenyl)ethyl]-5-[[2-(ethylamino)-9-methyl-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-2-sulfanylidene-1,3-thiazolidin-4-one ?
user
C25H26N4O4S2
assistant