[{"from": "human", "value": "Given SMILES, write its number-averaged molecular weight at room temperature and atmospheric pressure. ->  CC1=CC(C2(C3=CC=C(OCCCCCCCC)C=C3)C4=CC=C(OCCCCCCCC)C=C4)=C(S1)C5=C2C(S6)=C(S5)C7=C6C8=C(C7(C9=CC=C(OCCCCCCCC)C=C9)C%10=CC=C(OCCCCCCCC)C=C%10)C=C(C%11=C(N=C(C(C=CC=C%12)=C%12C%13=C%14C=CC=C%13)C%14=N%15)C%15=C(C)C=C%11)S8\n"}, {"from": "gpt", "value": " 10.2\n"}]