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 2-[3-(2-methylpropyl)-4-oxopyrido[2,3-d]pyrimidin-2-yl]sulfanyl-N-(2-thiophen-2-ylethyl)acetamide .
user
C19H22N4O2S2
assistant