You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-ethyl-1-(2-methoxyethyl)-1-[2-[(3R)-3-(4-methylphenyl)-5-thiophen-2-yl-3,4-dihydropyrazol-2-yl]-2-oxoethyl]urea is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H28N4O3S
assistant