You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(3-tert-butyl-1H-indol-6-yl)-3-methyl-7-oxo-4H-thieno[3,2-b]pyridine-6-carboxamide;molecular hydrogen is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H25N3O2S
assistant