[{"from": "human", "value": "What is weight-averaged molecular weight of given SMILES at normal measurement conditions.? ->  CC1=CC=C(C2=CC=C(C3=CC=C(C4=CC(C(CCCCCCCC)(CCCCCCCC)C5=C6C=CC(C)=C5)=C6C=C4)S3)C7=C2N=C(C8=CC=CC=C8)C(C9=CC=CC=C9)=N7)S1\n"}, {"from": "gpt", "value": " 39.5\n"}]