Product specification bortezomib n-2 stage intermediate name : n-[(1s)-1-benzyl-2-((1r)-3-methyl-1-[(1s, 2s, 6r, 8s)-2, 9, 9-trimethyl-3, 5-dioxa-4-boratricyclo[6.1.1.02, 6]dec-4-yl]butylamino)-2-oxoethyl]-2 pyrazinecarboxamidecas no : 205393-22-2description : pale yellow colored solid.