Which is a high quality product but with the lowest transacted quantity?
High quality refers to the product's quality class, therefore Class = 'H'; the lowest transacted quantity refers to Quantity = 1
SELECT T1.Name FROM Product AS T1 INNER JOIN TransactionHistory AS T2 ON T1.ProductID = T2.ProductID WHERE T1.Class = 'H' ORDER BY T2.Quantity ASC LIMIT 1