[{"from": "human", "value": "What is poly dispersity index of given SMILES at room temperature and atmospheric pressure? ->  CC(S1)=CC2=C1C(OCCCCCCCCCCCC)=C(C=C(C3=C4C(OCCO4)=C(C)S3)S5)C5=C2OCCCCCCCCCCCC\n"}, {"from": "gpt", "value": " 1.9\n"}]