You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3R,4S)-2-(2-methylpropyl)-1-oxo-N-(2-phenylethyl)-3-thiophen-2-yl-3,4-dihydroisoquinoline-4-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C26H28N2O2S
assistant