ethyl (E)-4-[1-(10H-pyrazino[2,3-b][1,4]benzothiazin-8-ylmethyl)piperidin-4-yl]-2-methylbutenoate

methyl [7-(10H-pyrazino[2,3-b][1,4]benzothiazin-8-ylmethyl)-7-azaspiro[3.5]non-2-yl]carboxylate