You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-(3,4-dimethoxyphenyl)-8-[(3,4-dimethoxyphenyl)methylidene]-5-methyl-1,3,4,5,6,7-hexahydroquinazoline-2-thione is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H30N2O4S
assistant