[{"from": "human", "value": "Write number-averaged molecular weight of given SMILES at room temperature and atmospheric pressure. ->  CC1=CC=C(C2=CC3=C(C(SC4=C5C(CCCCCCCC)(CCCCCCCC)C6=C4C=CC(C)=C6)=C5C3(CCCCCCCC)CCCCCCCC)C=C2)C7=NSN=C17\n"}, {"from": "gpt", "value": " 5\n"}]