1-Thia-4,8-diazaspiro(4.5)decan-3-one, 8-(2-(2,3-dihydro-1,4-benzodioxin-2-yl)ethyl)-, (Z)-2-butenedioate (1:1) 36844-85-6 8-(1,4-Benzodioxan-2-ylethyl)-3-oxo-1-thia-4,8-diazaspiro(4.5)decane maleate