[{"from": "human", "value": "Write solar cell PDI of given SMILES as a p-type polymer and PC71BM or PCBM. ->  CC1=C(CCCCCCCC)C(CCCCCCCC)=C(C2=CC=C(C3=CC=C(C)S3)S2)S1\n"}, {"from": "gpt", "value": " 4.23\n"}]