methyl 3-(2,2-dimethoxy-4,4,5,5-tetramethyl-1,3,25-dioxaphospholan-2-yl)-4-(dimethylamino)-2-methoxy-4-oxobutanoate

2-methoxy-4,4,5,5-tetramethyl-1,3,2-dioxaphospholane

2-butoxy-4,4,5,5-tetramethyl-[1,3,2]dioxaphospholane