[{"from": "human", "value": "Write solar cell fill factor of given SMILES as a p-type polymer and PC71BM or PCBM. ->  CC1=CC=C(C2=CC=C(C3=C4C(C(N(C(CCCCCCCC)CCCCCCCC)C4=O)=O)=C(C)S3)S2)S1\n"}, {"from": "gpt", "value": " 0.64\n"}]