[{"from": "human", "value": "Given SMILES, write its number-averaged molecular weight at room temperature and atmospheric pressure. ->  CC1=CC2=C(C3=CC(C(C4=CC=C(CCCCCC)C=C4)(C5=CC=C(CCCCCC)C=C5)C6=C7SC(C8=C(F)C(F)=C(C)C9=C8N=C%10C(C(C=C(CCCCCCCC)C=C%11)=C%11C%12=C%10C=C(CCCCCCCC)C=C%12)=N9)=C6)=C7C=C3C2(C%13=CC=C(CCCCCC)C=C%13)C%14=CC=C(CCCCCC)C=C%14)S1\n"}, {"from": "gpt", "value": " 1473\n"}]