Abstract: Ent-kaurenoic acid glycoside precursor compositions and synthesis methods are provided. The KA-19-monoside, KA-19-bioside and KA-19-trioside precursors can be used as starting materials for a variety of kaurenoic acid based reactions. The precursors provide alternative synthesis pathways for steviol glycosides to the natural pathway based on Steviol biosynthesis. The alternative synthesis pathways using the precursors also circumvent the rate limiting step of the natural Steviol biosynthesis pathway. The precursors can be used individually or in combination to produce a mixture or individual steviol glycosides such as Rebaudioside A, Rebaudioside D or Rebaudioside M. Control over the precursor quantities and composition allows control over the composition of the resulting steviol glycosides that are finally produced.