If 'SAVOURY' is coded as 'OVUARSY', then how will 'RADIATE' be coded?

IDAATRE

The pattern which is observed is that the last letter is held constant and the remaining letters are written alternatively initially from right to left and then left to right as follows:

_ _ _ _ _ _ Y

_ v _ A _ S Y

O V U A R S Y

Similarly, RADIATE will be coded as: 

_ _ _ _ _ _ E

_ D _ A _ R E

I D A A T R E