1,3-Diazaspiro[4.5]decane-2,4-dione702-62-5100 % similar 8-(Phenylmethyl)-1,3,8-triazaspiro[4.5]decane-2,4-dione28936-94-948 % similar 1,1-Dimethylethyl 2,4-dioxo-1,3,8-triazaspiro[4.5]decane-8-carboxylate183673-70-345 % similar 5-Ethyl-5-methylhydantoin16820-12-542 % similar Phenytoin57-41-036 % similar Nirvanol631-07-234 % similar 2-Azaspiro[4.5]decan-3-one64744-50-932 % similar