[{"from": "human", "value": "Given SMILES, write its number-averaged molecular weight at room temperature and atmospheric pressure. ->  CC(S1)=CC2=C1C(C3=CC(CCCCCCCCCC)=C(CCCCCCCCCC)S3)=C(C=C(C4=C(CCCCCC)C=C(C5=CC6=C(C=C(C7=CC(CCCCCC)=C(C)S7)C8=NSN=C86)C9=NSN=C59)S4)S%10)C%10=C2C%11=CC(CCCCCCCCCC)=C(CCCCCCCCCC)S%11\n"}, {"from": "gpt", "value": " 24.1\n"}]