You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule [4-[(2-butyl-1,3-thiazol-4-yl)methyl]piperazin-1-yl]-[(3S)-2,3-dihydro-1,4-benzodioxin-3-yl]methanone .
user
C21H27N3O3S
assistant