[{"from": "human", "value": "Given SMILES, write its weight-averaged molecular weight at room temperature and atmospheric pressure. ->  CC(S1)=CC2=C1C(OCCCCCCCCCCCC)=C(C=C(/C=C/C)S3)C3=C2OCCCCCCCCCCCC\n"}, {"from": "gpt", "value": " 67.1\n"}]