You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule 2-[[4-[2-[heptyl-(3-nitropyridin-2-yl)amino]ethyl]-1,3-thiazol-2-yl]sulfanyl]-2-methylpropanoic acid ?
user
C21H30N4O4S2
assistant