[{"from": "human", "value": "Given SMILES, write its number-averaged molecular weight at room temperature and atmospheric pressure. ->  CC1=C2C(C=C(S(=O)(CC(CC)CCCC)=O)S2)=C(C3=CC4=C(C(OCC(CC)CCCC)=C(C=C(C)S5)C5=C4OCC(CC)CCCC)S3)S1\n"}, {"from": "gpt", "value": " 788\n"}]