You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[(7-hydroxy-3,6-dihydro-2H-[1,4]dioxino[2,3-f]indol-8-yl)imino]-3-(4-methylphenyl)thiourea The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H16N4O3S
assistant