[{"from": "human", "value": "Given SMILES, write its solar cell FF at normal measurement conditions.. ->  CC1=CC2=C(C(C#C[Si](C(C)C)(C(C)C)C(C)C)=C(C=C(C3=C4C(C=C(C(OCC(CCCC)CC)=O)S4)=C(C)S3)S5)C5=C2C#C[Si](C(C)C)(C(C)C)C(C)C)S1\n"}, {"from": "gpt", "value": " 20.9\n"}]