[{"from": "human", "value": "Write solar cell FF of given SMILES as a p-type polymer and PC71BM or PCBM. ->  CC1=C(OCC(CCCCCCCC)CCCCCC)C(F)=C(C2=CC=C(C)S2)C3=NSN=C31\n"}, {"from": "gpt", "value": " 0.68\n"}]