[{"from": "human", "value": "Given SMILES, write its solar cell solar cell power conversion efficiency as a p-type polymer and PC71BM or PCBM. ->  O=C1N(CCCCCCCC)C(C2=CC=C(C)S2)=C3C1=C(C4=CC=C(C5=CC=C6C(C(CCCCCCCC)(CCCCCCCC)C7=C6C=CC(C)=C7)=C5)S4)N(CCCCCCCC)C3=O\n"}, {"from": "gpt", "value": " 0.74\n"}]