[{"from": "human", "value": "Given SMILES, write its weight-averaged molecular weight at room temperature and atmospheric pressure. ->  CC1=C(CC(CCCCCCCC)CCCCCCCCCC)C=C(C2=CC3=C(C(SC(C4=CC(CC(CCCCCCCCCC)CCCCCCCC)=C(C5=CC=C(C6=CC=C(C)S6)S5)S4)=C7)=C7C8=NON=C83)S2)S1\n"}, {"from": "gpt", "value": " 75.0\n"}]