You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-[(E)-(3-cyano-4,5,6,7-tetrahydro-1-benzothiophen-2-yl)iminomethyl]-1H-indole-5-carbonitrile is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H14N4S
assistant