You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
S-[2-[but-3-enyl-[[3-[(2S)-4-methylpiperazin-2-yl]-3-oxopropyl]carbamoyl]amino]ethyl] ethanethioate is the IUPAC name of a molecule. Please give its molecular formula.
user
C17H30N4O3S
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