[{"from": "human", "value": "What is solar cell poly dispersity index of given SMILES as a p-type polymer and PC71BM or PCBM? ->  CC1=CC(CCCCCCCCCC)=C(C2=NC(SC(C3=C(CCCCCCCCCC)C=C(C4=CC(CC(CCCCCC)CCCCCCCC)=C(C5=NC(SC(C6=C(CC(CCCCCC)CCCCCCCC)C=C(C)S6)=N7)=C7S5)S4)S3)=N8)=C8S2)S1\n"}, {"from": "gpt", "value": " 5.2\n"}]