[{"from": "human", "value": "Given SMILES, write its number-averaged molecular weight at room temperature and atmospheric pressure. ->  CC(S1)=CC=C1C2=C(C(C3=C(CC(CCCC)CC)SC(CC(CC)CCCC)=C3C4=O)=O)C4=C(S2)C5=CC=C(C6=CC7=C(C8=CC(SCCCC)=C(SCCCCCC)S8)C9=C(C=C(C)S9)C(C%10=CC(SCCCC)=C(SCCCCCC)S%10)=C7S6)S5\n"}, {"from": "gpt", "value": " 53\n"}]