8-(hydroxymethyl)-1,3-diazaspiro[4.5]decane-2,4-dione

(2,4-dioxo-1,3-diazaspiro[4.5]decan-8-yl)methyl 4-methylbenzenesulfonate

8-iodomethyl-1,3-diaza-spiro[4.5]decane-2,4-dione