[{"from": "human", "value": "What is solar cell fill factor of given SMILES as a p-type polymer and PC71BM or PCBM? ->  CC(S1)=CC2=C1C3=C(C(CC(CCCC)CCCC)=C(C4=C(C=C(C5=C6C(SC(C(OC(CC(CC)CCCC)CCC(CCCC)CC)=O)=C6F)=C(C)S5)S4)S7)C7=C3CC(CCCC)CCCC)S2\n"}, {"from": "gpt", "value": " 0.521\n"}]