You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 5-[[9-methyl-4-oxo-2-(pentylamino)pyrido[1,2-a]pyrimidin-3-yl]methylidene]-3-[(4-methylphenyl)methyl]-2-sulfanylidene-1,3-thiazolidin-4-one .
user
C26H28N4O2S2
assistant