| Catalogue Number: | R-0411 | 
| Compound Name: | Ribavirin EP Impurity D (Ribavirin USP Related Compound D) | 
| Synonyms: | 4H-1,2,4-triazole-3-carboxamide | 
| CAS#: | 3641-08-5 | 
| Alternate CAS#: | |
| Molecular Formula: | C3H4N4O | 
| Molecular Weight: | 112.09 | 
Ribavirin Impurity 56-13C-15N4 (Aminoguanidine-13C-15N4)
CAS No. 478189-68-3
13CH615N4. 0.5H2SO4
M.W. 79.05 0.5*98.07