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Diguanosine 5′-triphosphate (Gp3G) is a dinucleoside triphosphates. Diguanosine 5′-triphosphate also is a virus-specific oligonucleotide. Diguanosine 5′-triphosphate is needed for the synthesis of RNA during the transcription process[1][2].

[1] M Yamakawa, et al. Priming of reovirus transcription by GppppG and formation of CpG(5')GpC. Proc Natl Acad Sci U S A. 1982 Oct;79(20):6142-6. DOI:10.1073/pnas.79.20.6142
[2] Emmanuel Klein, et al. Synthesis of enzymatically and chemically non-hydrolyzable analogues of dinucleoside triphosphates Ap(3)A and Gp(3)G. J Org Chem. 2002 Jan 11;67(1):146-53. DOI:10.1021/jo015836e