(3aR,12bR)-5-chloro-2-(methyl-13C-d3)-2,3,3a,12b-tetrahydro-1H-dibenzo[2,3:6,7]oxepino[4,5-c]pyrrole fumarate,(3aR,12bR)-5-chloro-2-methyl-2,3,3a,12b-tetrahydro-1H-dibenzo[2,3:6,7]oxepino[4,5-c]pyrrole fumarate,"Labeled Asenapine, intended for use as an internal standard for the quantification of Asenapine by GC- or LC-mass spectrometry.",Asenapine Therapeutic