[{"from": "human", "value": "Write solar cell fill factor of given SMILES. ->  CC1=CC2=C(C(OCC(CCCC)CC)=C(C=C(C3=C4C(C(N(CCCCCCC)C4=O)=O)=C(C)S3)O5)C5=C2OCC(CC)CCCC)O1\n"}, {"from": "gpt", "value": " BDF(2EH/C7)\n"}]