[{"from": "human", "value": "Given SMILES, write its solar cell average value of power conversion efficiency as a p-type polymer and PC71BM or PCBM. ->  CC1=CC2=C(C(OCCCCCCCCCCCC)=C(C=C(C3=C(CCCCCCCCCCCC)C=C(C4=CC=C(C5=CC(CCCCCCCCCCCC)=C(C)S5)C6=NN(CCCCCCCCCCCC)N=C64)S3)S7)C7=C2OCCCCCCCCCCCC)S1\n"}, {"from": "gpt", "value": " 2.9\n"}]