[{"from": "human", "value": "Write weight-averaged molecular weight of given SMILES at normal measurement conditions.. ->  CC1=CC(N(CCCCCCCC)C2=C3C=CC(C4=CC=C(C5=C(OCCCCCCCC)C(OCCCCCCCC)=C(C6=CC=C(C)S6)C7=C5N=C(C8=CC=C(OCCCCCCCC)C=C8)C(C9=CC=C(OCCCCCCCC)C=C9)=N7)S4)=C2)=C3C=C1\n"}, {"from": "gpt", "value": " 21.4\n"}]