[{"from": "human", "value": "Given SMILES, write its number-averaged molecular weight at room temperature and atmospheric pressure. ->  O=C(N1CC(CCCCCCCC)CCCCCCCCCC)/C(C2=C1C=C(C(S3)=CC=C3C4=CC(C(C5=CC=C(CC(CC)CCCC)S5)=C(SC(C6=CC=C(C)S6)=C7)C7=C8C9=CC=C(CC(CC)CCCC)S9)=C8S4)C=C2)=C%10C(N(CC(CCCCCCCCCC)CCCCCCCC)C%11=CC(C)=CC=C%11/%10)=O\n"}, {"from": "gpt", "value": " 1591\n"}]