[{"from": "human", "value": "Given SMILES, write its weight-averaged molecular weight at room temperature and atmospheric pressure. ->  CC1=CC2=C(C(C3=CC=C(CCCCCC)S3)=C(C=C(C4=CC=C(C)C5=C4N=C(C6=CC=C(CCCCCC)S6)C(C7=CC=C(CCCCCC)S7)=N5)S8)C8=C2C9=CC=C(CCCCCC)S9)S1\n"}, {"from": "gpt", "value": " 14.6\n"}]