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 (1'S,2S,5'S,6'S)-6-methyl-4-oxospiro[3H-chromene-2,2'-bicyclo[3.1.0]hexane]-6'-carboxylic acid .
user
C16H16O4
assistant