You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4,6-dimethyl-2-[4-(1,2-oxazol-3-ylmethylsulfonyl)piperazin-1-yl]pyridine-3-carbonitrile The above is the IUPAC name of a molecule. Write its molecular formula.
user
C16H19N5O3S
assistant