Write SQL query to solve given problem: Describe the product names delivered in 2021 for the customer "Sundial".. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT T FROM ( SELECT DISTINCT CASE  WHEN T2.DeliveryDate LIKE '%/%/21' AND T1.`Customer Names` = 'Sundial ' THEN T3.`Product Name` END AS T FROM Customers T1 INNER JOIN `Sales Orders` T2 ON T2._CustomerID = T1.CustomerID INNER JOIN Products T3 ON T3.ProductID = T2._ProductID ) WHERE T IS NOT NULL