You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as 3-[3-(4-methylthiophen-2-yl)pyrido[2,3-b]pyrazin-6-yl]-1-prop-2-enyl-1-sulfanylurea using the IUPAC nomenclature.
user
C16H15N5OS2
assistant