You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule (E)-3-(3-methylphenyl)-1-[4-[(3-thiophen-2-yl-1,2,4-oxadiazol-5-yl)methyl]piperazin-1-yl]prop-2-en-1-one ?
user
C21H22N4O2S
assistant