You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-[[4-(1H-indol-3-yl)-3,6-dihydro-2H-pyridin-1-yl]sulfonyl]-3,5-dimethyl-1,2-oxazole is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H19N3O3S
assistant