[{"from": "human", "value": "What is solar cell FF of given SMILES as a p-type polymer and PC71BM or PCBM? ->  CC1=CC(OCC(CCCCCCCC)CCCCCC)=C(C2=CC=C(C3=C(F)C(F)=C(C4=CC=C(C)S4)C5=NSN=C35)S2)C=C1OCC(CCCCCC)CCCCCCCC\n"}, {"from": "gpt", "value": " 0.636\n"}]