You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name N-(2,3-dihydro-1H-inden-2-yl)-2-[(4-prop-2-enyl-5-pyridin-3-yl-1,2,4-triazol-3-yl)sulfanyl]acetamide into its molecular formula.
user
C21H21N5OS
assistant