2,8-Diazaspiro(4.5)decane-1,3-dione, 2-ethyl-8-methyl-, (E)-2-butenedioate (1:1) (9CI) 2,8-Diazaspiro(4.5)decane-1,3-dione, 2-ethyl-8-methyl-, fumarate 2-Ethyl-8-methyl-2,8-diazaspiro(4.5)decane-1,3-dione fumarate 3576-73-6 51382-46-8 RS 86