[{"from": "human", "value": "Given SMILES, write its poly dispersity index at room temperature and atmospheric pressure. ->  CC1=CC=C(C2=C3C(C(N2CC(CCCCCCCC)CCCCCC)=O)=C(C4=CC(C)=C(C5=CC=C(C)S5)S4)N(CC(CCCCCC)CCCCCCCC)C3=O)S1\n"}, {"from": "gpt", "value": " 1.65\n"}]