You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[(5,8-dimethyl-2-oxo-1H-quinolin-3-yl)methyl]-3-(4-ethoxyphenyl)-1-(oxolan-2-ylmethyl)thiourea is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H31N3O3S
assistant