You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-amino-4-methyl-2-[(2R)-2-methyl-2,3-dihydroindole-1-carbonyl]-7H-thieno[2,3-b]pyridin-6-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H17N3O2S
assistant