[{"from": "human", "value": "Given SMILES, write its weight-averaged molecular weight at room temperature and atmospheric pressure. ->  CC1=CC2=C(C(C(C3=CC=C(CCCCCC)C=C3)(C4=CC=C(CCCCCC)C=C4)C5=C6C=C7C(C(SC8=C9SC(C%10=CC%11=C(C=C(C)S%11)S%10)=C8)=C9C7(C%12=CC=C(CCCCCC)C=C%12)C%13=CC=C(CCCCCC)C=C%13)=C5)=C6S2)S1\n"}, {"from": "gpt", "value": " 60.8\n"}]