[{"from": "human", "value": "Write solar cell poly dispersity index of given SMILES as a p-type polymer and PC71BM or PCBM. ->  O=C(OCC(CC)CCCC)C1=C(F)C2=C(C3=CC4=C(C(C5=CC(SC(CC(CC)CCCC)=C6)=C6S5)=C(C=C(C)S7)C7=C4C8=CC(SC(CC(CCCC)CC)=C9)=C9S8)S3)SC(C)=C2S1\n"}, {"from": "gpt", "value": " 7.71\n"}]