ethyl [3-(10H-pyrazino[2,3-b][1,4]benzothiazin-8-ylmethyl)-3-azabicyclo[3.3.1]non-9-ylidene]acetate

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

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

ethyl (anti)-[3-(10H-pyrazino[2,3-b][1,4]benzothiazin-8-ylmethyl)-3-azabicyclo[3.3.1]non-9-yl]acetate

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