[{"from": "human", "value": "Given SMILES, write its number-averaged molecular weight at room temperature and atmospheric pressure. ->  CC(S1)=CC2=C1C3=C(N2CC(CCCCCCCCCC)CCCCCCCC)C=C(C(N4CC(CCCCCCCCCC)CCCCCCCC)=C3)C5=C4C=C(S5)C6=C7C(C(N(CC(CC)CCCC)C7=O)=O)=C(C8=C(C(N(CC(CC)CCCC)C9=O)=O)C9=C(C)S8)S6\n"}, {"from": "gpt", "value": " 22\n"}]