You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 2-[(8-ethoxy-5H-[1,2,4]triazino[5,6-b]indol-3-yl)sulfanyl]-1-[(3S)-3-methylpiperidin-1-yl]ethanone into its molecular formula.
user
C19H23N5O2S
assistant