[{"from": "human", "value": "Given SMILES, write its solar cell maximum value of power conversion efficiency as a p-type polymer and PC71BM or PCBM. ->  CC(S1)=CC2=C1C(C3=CC=C(CCCCCCCCCCCC)S3)=C(C=C(C4=C5C(C(N(CCCCCCCC)C5=O)=O)=C(C)S4)S6)C6=C2C7=CC=C(CCCCCCCCCCCC)S7\n"}, {"from": "gpt", "value": " 4.5\n"}]