You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-(1-adamantyl)-3-[(1R,2S,4S,5'S,6R,7S,8R,9S,12S,13S,16R,18R)-5',7,9,13-tetramethylspiro[5-oxapentacyclo[10.8.0.02,9.04,8.013,18]icosane-6,2'-oxane]-16-yl]urea is the IUPAC name of a molecule. Please give its molecular formula.
user
C38H60N2O3
assistant