You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[4-(4,6-dimethyl-1,3-benzothiazol-2-yl)piperazin-1-yl]-(3-methyl-1,2-oxazol-5-yl)methanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H20N4O2S
assistant