[{"from": "human", "value": "What is solar cell poly dispersity index of given SMILES as a p-type polymer and PC71BM or PCBM? ->  CC(S1)=CC2=C1C(C3=CC(F)=C(CC(CCCC)CC)S3)=C(C=C(C4=CC=C(C5=C6C(C(F)=C(C(OCC(CCCCCCCC)CCCCCC)=O)S6)=C(C7=CC=C(C)S7)S5)S4)S8)C8=C2C9=CC(F)=C(CC(CCCC)CC)S9\n"}, {"from": "gpt", "value": " 8.6\n"}]