[{"from": "human", "value": "Given SMILES, write its number-averaged molecular weight at normal measurement conditions.. ->  CC1=CC(C(C2=CC=C(CCCCCC)C=C2)(C3=CC=C(CCCCCC)C=C3)C4=CC(C(SC(C5=CC6=C(C(SC(C)=C7)=C7N(CC(CCCCCCCCCC)CCCCCCCC)C6=O)S5)=C8)=C8C9(C%10=CC=C(CCCCCC)C=C%10)C%11=CC=C(CCCCCC)C=C%11)=C9C=C4%12)=C%12S1\n"}, {"from": "gpt", "value": " 23.9\n"}]