You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 5-methyl-3-[[4-(pyridin-4-ylmethyl)piperazin-1-yl]sulfonylmethyl]-1,2-oxazole by IUPAC nomenclature, provide its molecular formula.
user
C15H20N4O3S
assistant