[{"from": "human", "value": "Given SMILES, write its weight-averaged molecular weight at room temperature and atmospheric pressure. ->  CC1=CC=C(C2=CC=C(C(N(CCCCCCCCCCCC)C3=O)=C4C3=C(C5=CC=C(C)O5)N(CCCCCCCCCCCC)C4=O)O2)S1\n"}, {"from": "gpt", "value": " 78.0\n"}]