You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the compound with this IUPAC name 1-(2-methylphenyl)-3-[(1S,2S)-1-(4-methylpiperazin-1-yl)-1-thiophen-2-ylpropan-2-yl]thiourea ?
user
C20H28N4S2
assistant