You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl 7-[(1R,2S,3R,5S)-5-hydroxy-3-(hydroxymethyl)-2-(3-oxooct-1-enyl)cyclopentyl]heptanoate is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H38O5
assistant