[{"from": "human", "value": "Given SMILES, write its weight-averaged molecular weight at normal measurement conditions.. ->  CC1=C(C(F)=C(C(OCC(CCCCCC)CCCC)=O)S2)C2=C(S1)C(S3)=CC(S4)=C3C(C4=C5OCC(CCCCCC)CCCC)=C(OCC(CCCC)CCCCCC)C6=C5C7=C(C8=C(OCC(CCCC)CC)C9=C(C=C(C)S9)C(OCC(CC)CCCC)=C8S7)S6\n"}, {"from": "gpt", "value": " 12.3\n"}]