You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 2-[1-(5-chloropyridin-3-yl)sulfanyl-3-[4-(3,4-difluorophenyl)triazol-1-yl]-2-hydroxypropoxy]butane-1,3-diol .
user
C20H21ClF2N4O4S
assistant