[{"from": "human", "value": "What is solar cell PDI of given SMILES as a p-type polymer and PC71BM or PCBM? ->  O=C(OCC(CC)CCCC)C1=CC2=C(C)SC(C3=C(F)C4=C(C(OCC(CC)CCCC)=C(C(F)=C(C)S5)C5=C4OCC(CC)CCCC)S3)=C2S1\n"}, {"from": "gpt", "value": " 3.2\n"}]