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 (3'R,4S,4'S,5'R,6'R)-3',4',5'-tributoxy-6'-(butoxymethyl)-7-chloro-6-[(4-ethylphenyl)methyl]-2-methoxyspiro[2,3-dihydrochromene-4,2'-oxane] .
user
C40H61ClO7
assistant