[{"from": "human", "value": "Given SMILES, write its number-averaged molecular weight at room temperature and atmospheric pressure. ->  CC1=CC2=C(C(SC(C3=C(CCCCCC)C=C(C4=CC=C(C5=CC(CCCCCC)=C(C)S5)C6=NSN=C64)S3)=C7)=C7[Si](CCCC)(CCCC)[Si]2(CCCC)CCCC)S1\n"}, {"from": "gpt", "value": " 942\n"}]