Glycosylated Steviol Glycosides(GSG) is also called Enzyme Modified Stevia.

EnzymeModified Stevia (Glucosyl Steviol Glycosides or GSG) is a series of natural flavors with modifying properties (FMPs) made from stevia leaf   extract.

GSG is about 150 times the sweetness of sucrose, which is relatively low compared to steviol glycosides. However, it is still considered to be a good   choice in sugar reduction products development since it is economic. GSG has stable properties, long shelf life, and is not easy to react   with other   substances, making it widely applied in many situations.