[{"from": "human", "value": "Write weight-averaged molecular weight of given SMILES at room temperature and atmospheric pressure. ->  O=C1C(C2=C(C3=CC=C(C)O3)N1CC(CCCC)CC)=C(C(O4)=CC=C4C(S5)=CC(CCCCCCCCCC)=C5C(O6)=C(CCCCCCCCCC)C(C6=C7)=CC8=C7C(CCCCCCCCCC)=C(C9=C(CCCCCCCCCC)C=C(C)S9)O8)N(C[C@@H](CC)CCCC)C2=O\n"}, {"from": "gpt", "value": " 28.9\n"}]