Name the item ordered by Jonathan Doherty with the highest quantity in the East region.
Jonathan Doherty is the "Customer Name"; highest quantity refers to MAX(Quantity); Region = 'East'
SELECT T3.`Product Name` FROM east_superstore AS T1 INNER JOIN people AS T2 ON T1.`Customer ID` = T2.`Customer ID` INNER JOIN product AS T3 ON T3.`Product ID` = T1.`Product ID` WHERE T2.`Customer Name` = 'Jonathan Doherty' AND T2.Region = 'East' ORDER BY T1.Quantity DESC LIMIT 1