| Exemestane process Impurity 2 | 115936-71-5 | Ax-IMP1959 |
| Nicorandil Impurity | NA | Ax-IMP1960 |
| Primapterin Impurity | 123168-30-9 | Ax-IMP1743 |
| L-arabinose phenylhydrazone | 42015-07-6; 622-12-8 | Ax-IMP1744 |
| phenylhydrazine : 1-methylene-2-phenylhydrazine | 6228-40-6 | Ax-IMP1745 |
| Acetone phenylhydrazone | 103-02-6 | Ax-IMP1746 |
| 5-Deoxy-L-arabinose phenylhydrazone | 59245-36-2 | Ax-IMP1748 |
| 5-deoxy-2,3,4-O-triacetyl-L-arabinose-phenylhydrazone | 95895-36-6 | Ax-IMP1747 |
| L-biopterin Process Impurity | NA | Ax-IMP1750 |
| 1',2'-O-diacetyl-L-biopterin | 62933-57-7 | Ax-IMP1749 |