You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N'-(4,5,6,7,8,9-hexahydrocycloocta[b]thiophene-2-carbonyl)-2-methylpyrazolo[1,5-a]pyrimidine-3-carbohydrazide is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H21N5O2S
assistant