3-Hydroxy Midostaurin-D5 is a deuterium-labeled 3-Hydroxy Midostaurin (T12610L) which is a metabolite of PKC412. PKC412 effectively inhibits FMS-like tyrosine kinase-3 (FLT3) autophosphorylation (IC50s: 132 nM and 9.8 μM in culture medium and plasma).