[{"from": "human", "value": "Write weight-averaged molecular weight of given SMILES at normal measurement conditions.. ->  CC1=CC=C(C2=CC=C(C)C3=C2N=C(C4=CC=C(OCCCCCCCC)C=C4)C(C5=CC=C(OCCCCCCCC)C=C5)=N3)S1\n"}, {"from": "gpt", "value": " 648\n"}]