Patent: US20110111016 A1 | Phillips, Nigel C. et al. published a patent in 2011| cas: 550-33-4

(2R,3S,4R,5R)-2-(Hydroxymethyl)-5-(9H-purin-9-yl)tetrahydrofuran-3,4-diol (cas: 550-33-4) belongs to tetrahydrofuran derivatives. Tetrahydrofuran (THF), or oxolane, is mainly used as a precursor to polymers. Being polar and having a wide liquid range, THF is a versatile solvent. THF (Tetrahydrofuran) is also used as a starting material for the synthesis of poly(tetramethylene ether) glycol (PTMG), etc.Synthetic Route of C10H12N4O4  

Non-DNA base-containing polynucleotide compositions and their use for the modulation of immune responses was written by Phillips, Nigel C.; Filion, Mario C.. And the patent was published on May 12,2011.Synthetic Route of C10H12N4O4   The following contents are mentioned in the patent:

The present invention provides compositions comprising synthetic non-DNA base-containing polynucleotide sequences of 3 to 30 bases in length comprising one or more non-DNA bases wherein the bases are nebularine, hypoxanthine, or uracil, or combinations of nebularine, hypoxanthine and uracil bases, in combination with a pharmaceutically acceptable vehicle, particularly one or more adjuvant vehicle, and one or more antigen. The present invention relates to methods of administering these compositions for inducing or modulating an immune response in vitro or in vivo, and particularly for activating antigen presenting cells. The present invention relates to compositions comprising synthetic non-DNA base-containing polynucleotides, a pharmaceutically acceptable vehicle and optionally one or more antigens, and their use to modulate immune responses. Several of the compositions of the present invention permit lower doses of antigen to be used in a vaccine formulation. This study involved multiple reactions and reactants, such as (2R,3S,4R,5R)-2-(Hydroxymethyl)-5-(9H-purin-9-yl)tetrahydrofuran-3,4-diol (cas: 550-33-4Synthetic Route of C10H12N4O4  ).

(2R,3S,4R,5R)-2-(Hydroxymethyl)-5-(9H-purin-9-yl)tetrahydrofuran-3,4-diol (cas: 550-33-4) belongs to tetrahydrofuran derivatives. Tetrahydrofuran (THF), or oxolane, is mainly used as a precursor to polymers. Being polar and having a wide liquid range, THF is a versatile solvent. THF (Tetrahydrofuran) is also used as a starting material for the synthesis of poly(tetramethylene ether) glycol (PTMG), etc.Synthetic Route of C10H12N4O4  

Referemce:
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem