[{"from": "human", "value": "What is poly dispersity index of given SMILES at normal measurement conditions.? ->  CC(S1)=CC2=C1C(C3=CC=C(OCC(CCCC)CC)C=C3)=C(C=C(C4=CC=C(C5=C(OCCCCCCCC)C(OCCCCCCCC)=C(C6=CC=C(C)S6)C7=NON=C75)S4)S8)C8=C2C9=CC=C(OCC(CC)CCCC)C=C9\n"}, {"from": "gpt", "value": " 1.6\n"}]