[{"from": "human", "value": "Given SMILES, write its number-averaged molecular weight at room temperature and atmospheric pressure. ->  O=C(N1CC(CCCCCCCCCC)CCCCCCCCCCCC)C(C2=C1C3=CC=C(S3)C4=CC(C(OCC(CC)CCCC)=C(SC(C)=C5)C5=C6OCC(CCCC)CC)=C6S4)=C(C7=CC=C(C)S7)N(CC(CCCCCCCCCCCC)CCCCCCCCCC)C2=O\n"}, {"from": "gpt", "value": " 122\n"}]