[{"from": "human", "value": "Given SMILES, write its number-averaged molecular weight at room temperature and atmospheric pressure. ->  CC1=CC2=C(C(C3=CC=C(CC(CC)CCCC)S3)=C(C=C(C4=CC5=C(C=C(C6=C(C(N(CCCCCCCC)C7=O)=O)C7=C(C8=CC9=C(C=C(C)S9)S8)S6)S5)S4)S%10)C%10=C2C%11=CC=C(CC(CC)CCCC)S%11)S1\n"}, {"from": "gpt", "value": " 12\n"}]