Reference Standard
| CAS Number | Not assigned |
| Formula | C₄₄H₆₇NO₁₁ |
| Molecular Weight | ~786 g/mol |
| Purity | ≥95% |
| Storage | Store frozen (−20 °C) under inert conditions |
A dehydrogenated degradation impurity of tacrolimus formed during thermal or oxidative stress.
Used in forced degradation studies and impurity profiling for tacrolimus API.
Identified by LC-MS, HPLC, UV spectral comparison, and NMR.
