You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[(3R)-3-(1,3-benzothiazol-2-yl)piperidin-1-yl]-2-[(4-prop-2-enyl-1,2,4-triazol-3-yl)sulfanyl]ethanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H21N5OS2
assistant