You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule [(2R,4aR,6S,7R,8S,8aS)-8-hydroxy-6-methoxy-2-phenyl-4,4a,6,7,8,8a-hexahydropyrano[3,2-d][1,3]dioxin-7-yl] prop-2-ynyl carbonate ?
user
C18H20O8
assistant