You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 3-ethyl-1-(2-methoxyethyl)-1-[2-[(3R)-3-(3-methylthiophen-2-yl)-5-thiophen-2-yl-3,4-dihydropyrazol-2-yl]-2-oxoethyl]urea .
user
C20H26N4O3S2
assistant