You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(1R,2S,3S,4R,5'R,7S,8R,9S,12S,13S,15R,16R,18S)-5',7,9,13-tetramethylspiro[5-oxapentacyclo[10.8.0.02,9.04,8.013,18]icosane-6,2'-oxane]-3,15,16-triol The above is the IUPAC name of a molecule. Write its SMILES notation.
user
CC1CCC2(OC1)OC1C(O)C3C4CCC5CC(O)C(O)CC5(C)C4CCC3(C)C1C2C
assistant